Preparing for the National Defence Academy (NDA) examination requires a clear strategy, consistent practice, and the right guidance. If you have 150 days left for the NDA exam, this is enough time to build a strong foundation, improve your accuracy, revise important topics, and practise mock tests with a structured study plan.
Many students preparing for NDA 2027 often ask how to complete the syllabus, manage Mathematics and GAT together, improve English, and prepare for the SSB interview. The answer is simple: follow a realistic timetable, focus on important concepts, practise questions daily, and analyse your performance regularly.
At The Lakshya Academy, we believe that a well-planned NDA preparation strategy helps students use their time effectively and work towards their defence career goals.
In this blog, you will learn how to prepare for the NDA exam in 150 days, divide your syllabus into manageable phases, create a daily study routine, and prepare for the next stage of selection.
What Is the NDA Exam?
The National Defence Academy examination is conducted by the Union Public Service Commission (UPSC) for admission to the Army, Navy, and Air Force wings of the National Defence Academy, as well as the Indian Naval Academy’s 10+2 Cadet Entry Scheme, as applicable under the notification.
The NDA selection process includes a written examination followed by the Services Selection Board (SSB) assessment for candidates who qualify and meet the relevant eligibility conditions.
The written examination has two papers:
Mathematics: 300 marks
General Ability Test (GAT): 600 marks
The written examination carries a total of 900 marks. The SSB assessment carries another 900 marks.
Mathematics tests your understanding of mathematical concepts and problem-solving skills. GAT covers English, General Knowledge, Science, Social Studies, and other areas specified in the official syllabus.
Before starting your preparation, check the latest UPSC NDA notification for the examination date, eligibility requirements, syllabus, and selection rules.
Why Is a 150-Day NDA Preparation Strategy Important?
A 150-day NDA study plan helps you divide your preparation into clear and manageable stages. Instead of studying randomly, you can focus on completing the syllabus, practising questions, revising weak topics, and improving your performance.
A structured NDA preparation strategy can help you:
- Complete the NDA Mathematics and GAT syllabus systematically.
- Strengthen basic concepts in Mathematics, English, and Science.
- Improve speed and accuracy through regular question practice.
- Identify weak topics through mock tests.
- Revise important formulas, facts, and concepts.
- Develop time-management skills for the written examination.
- Begin understanding the SSB interview and its assessment process.
Remember that completing the syllabus is only one part of preparation. Regular revision and test analysis are equally important.
150 Days NDA Preparation Strategy: Complete Study Plan
Divide your 150-day NDA preparation into five phases. Each phase should have a specific objective so that you can measure your progress and make improvements.
Phase 1: Days 1–30 – Build Your Foundation
The first 30 days should focus on strengthening your basic concepts. Avoid rushing through advanced questions before understanding the fundamentals.
Mathematics preparation
Start with topics such as:
Sets, relations, and functions
Algebra and quadratic equations
Trigonometry
Complex numbers
Matrices and determinants
Basic coordinate geometry
Follow the official syllabus and adjust the order according to your current level. Practise basic questions before moving to moderate and advanced problems.
English preparation
English is an important part of the GAT paper. Focus on:
Grammar rules
Parts of speech
Tenses and subject-verb agreement
Vocabulary building
Synonyms and antonyms
Reading comprehension
Learn new vocabulary every day and revise previously studied words regularly.
General Knowledge preparation
Begin with the basics of Physics, Chemistry, Biology, History, Geography, and Polity. Read current affairs from reliable sources and maintain short revision notes.
Target for the first 30 days: Build a strong foundation and establish a consistent study routine.
Phase 2: Days 31–60 – Cover Important Syllabus Topics
During the next 30 days, increase your focus on syllabus coverage and question-solving practice.
Mathematics
Move towards topics such as:
- Permutations and combinations
- Probability
- Statistics
- Sequences and series
- Differential calculus
- Integral calculus
Vectors and three-dimensional concepts
Cover the topics according to the official syllabus and your preparation level. Practise previous-year questions after completing each topic.
GAT preparation
Continue English grammar, vocabulary, and comprehension practice. For General Knowledge, study the prescribed Science and Social Studies topics, including important historical events, geographical concepts, constitutional fundamentals, and basic scientific principles.
Current affairs should be a regular part of your routine rather than something you leave until the final month.
Practice strategy
At the end of each week, attempt a short topic-wise test. Analyse every incorrect answer and revise the concepts behind your mistakes.
Target for days 31- 60: Complete a substantial portion of the syllabus and develop confidence in solving exam-level questions.
Phase 3: Days 61–90 – Strengthen Concepts and Practise Previous-Year Questions
The third phase is about converting your knowledge into exam performance.
By this stage, you should have covered the basics and be familiar with most of the major topics in your study plan.
Focus on the following activities:
- Solve NDA Mathematics previous-year questions.
- Practise English questions within a fixed time limit.
- Attempt topic-wise GAT questions.
- Revise formulas, grammar rules, and factual notes.
- Identify frequently repeated question patterns.
- Maintain a notebook of mistakes and difficult questions.
Previous-year papers help you understand the nature and difficulty of the examination. However, do not rely only on repeated questions. Your preparation should cover the full prescribed syllabus.
Start attempting sectional tests under timed conditions. This will help you recognise which questions to solve first and when to move on from a difficult question.
Target for days 61–90: Improve accuracy, question selection, and time management.
Phase 4: Days 91–120 – Mock Tests and Intensive Revision
The fourth phase should focus on testing your preparation and correcting weaknesses.
Begin attempting full-length mock tests based on the latest NDA examination pattern.
After every mock test, analyse:
- Which topics caused the most mistakes?
- Which questions consumed too much time?
- Did you attempt questions without sufficient confidence?
- Were your errors caused by weak concepts or calculation mistakes?
- Which subjects need additional revision?
For Mathematics, revise formulas and practise questions from your weaker chapters.
For GAT, revise English grammar, vocabulary, Science, History, Geography, Polity, and other syllabus areas. Continue current-affairs revision where relevant.
Do not measure progress only by the number of mock tests completed. The quality of your analysis and the improvement you make after each test matter more.
Target for days 91-120: Improve mock-test performance and reduce avoidable errors.
Phase 5: Days 121–150 – Final Revision and Exam Readiness
The final 30 days should focus on consolidation rather than starting too many new resources.
Prioritise the following:
- Revise important Mathematics formulas.
- Revisit difficult questions from previous-year papers.
- Review English grammar rules and vocabulary.
- Revise concise notes for General Knowledge.
- Attempt full-length mock tests at appropriate intervals.
- Analyse mistakes and revise weak topics.
- Practise managing time across both papers.
In the final few days, avoid exhausting yourself with excessive study hours. Maintain a consistent sleep schedule and keep your examination documents and travel arrangements ready.
Check the latest official instructions regarding the examination schedule, reporting time, permitted items, and other requirements.
Target for days 121-150: Enter the examination with revised concepts, a clear strategy, and confidence in your preparation.
Daily Timetable for NDA Preparation
A daily timetable helps you balance Mathematics, GAT, revision, and physical activity. The following is a sample routine that you can adapt to your school or college schedule.
Morning session
Spend approximately two hours on Mathematics. Study one concept, solve examples, and practise questions independently.
English practice
Spend 45 minutes on grammar, vocabulary, and comprehension.
General Knowledge session
Study Science or Social Studies for approximately 60–90 minutes. Rotate subjects throughout the week.
Question practice
Spend another 45–60 minutes solving previous-year questions or topic-wise tests.
Revision session
Reserve 30 minutes for formulas, vocabulary, factual notes, and questions you answered incorrectly.
Physical fitness
Include regular exercise, running, mobility work, and adequate recovery according to your fitness level. Physical preparation is useful for general fitness and future defence-selection demands, although it does not replace the written-examination syllabus.
Students attending school or college can use shorter sessions on busy days and longer sessions on weekends. Consistency matters more than following an unrealistic timetable.
How to Prepare for NDA Mathematics in 150 Days
Mathematics carries 300 marks in the NDA written examination, making it an important part of your preparation.
Start by understanding the concepts rather than memorising solutions. Practise basic questions first and gradually increase the difficulty level.
Follow these steps:
- Study one topic at a time.
- Learn and revise the relevant formulas.
- Solve examples without looking at the solution.
- Practise previous-year questions.
- Record mistakes and difficult problems.
- Revisit weak topics every week.
- Attempt timed Mathematics tests regularly.
Accuracy is especially important because the NDA written examination uses negative marking. Avoid blind guessing and learn to make sensible decisions about question selection.
How to Prepare for NDA GAT in 150 Days
The General Ability Test carries 600 marks and includes English and General Knowledge.
English Preparation
Focus on grammar, vocabulary, sentence structure, comprehension, and usage. Read English passages regularly and practise questions in an exam-like environment.
If you are a Hindi-medium student, begin with fundamental grammar and gradually increase your exposure to English. Learn vocabulary in context and practise reading short English passages every day.
A strong English routine can improve your familiarity with the language and help you approach the English section more confidently.
Science Preparation
Revise fundamental concepts in Physics, Chemistry, and Biology according to the NDA syllabus. Use concise notes, diagrams, definitions, and topic-wise questions to reinforce your understanding.
History, Geography, and Polity
Study major historical events, important geographical features, the Indian Constitution, and fundamental political concepts. Connect facts with their underlying concepts wherever possible.
Current Affairs
Follow reliable news sources and prepare short notes on significant national and international developments. Revise those notes periodically instead of collecting information without reviewing it.
Common Mistakes to Avoid During NDA Preparation
Even students who study for several hours daily may struggle if they do not follow an effective strategy.
Avoid these common mistakes:
1. Studying without a timetable
Create a weekly plan with realistic daily targets. Review your progress every seven days.
2. Ignoring Mathematics basics
Advanced questions become difficult when fundamental concepts are unclear. Strengthen your basics before increasing the difficulty level.
3. Neglecting English
Do not postpone English preparation until the final weeks. Daily grammar, vocabulary, and reading practice can help build familiarity over time.
4. Using too many study resources
Choose reliable resources aligned with the syllabus. Revising one set of notes properly is often more useful than repeatedly changing books and materials.
5. Taking mock tests without analysing them
A mock test is a diagnostic tool. Identify your mistakes and revise the relevant topics before attempting another test.
6. Ignoring negative marking
Learn when to attempt a question and when to leave it. Uninformed guessing can reduce your score.
7. Preparing for the written examination alone
Understand the broader NDA selection process, including the SSB assessment. Develop communication, awareness, and healthy daily habits alongside academic preparation.
When Should You Start SSB Interview Preparation?
SSB preparation should not be treated as something that begins only after the written examination result.
Candidates can gradually familiarise themselves with the five-day SSB process, including screening tests, psychological assessments, Group Testing Officer (GTO) tasks, the personal interview, and the conference.
You can begin by developing the following habits:
- Read about national and international issues.
- Practise expressing your thoughts clearly.
- Improve listening and communication skills.
- Reflect on your strengths and areas for improvement.
- Participate in teamwork and group activities.
- Learn the purpose of common SSB assessment tasks.
The SSB process is designed to assess a range of officer-like qualities and suitability for a career in the Armed Forces. Preparation should focus on self-awareness, practical thinking, and genuine development rather than memorising supposedly perfect answers.
Why Choose The Lakshya Academy for NDA Preparation?
Choosing the right guidance can help you organise your NDA preparation and identify areas that need improvement.
The Lakshya Academy provides defence-examination preparation support for aspirants pursuing goals such as NDA, CDS, AFCAT, and SSB.
A structured preparation programme can help students work on syllabus coverage, question practice, revision, mock-test analysis, and understanding the defence-selection process.
Before choosing a coaching programme, students should review the course structure, faculty support, study schedule, practice resources, and the level of individual feedback offered.
Visit the official website of The Lakshya Academy at www.lakshyaacademy.co.in to explore the available preparation options.
Final Words: Follow Your 150-Day NDA Study Plan Consistently
Preparing for NDA in 150 days requires discipline, planning, and regular evaluation. Start with your fundamentals, cover the syllabus systematically, practise previous-year questions, and use mock tests to identify weaknesses.
Give appropriate attention to Mathematics, English, and General Knowledge. Revise regularly, maintain a healthy routine, and become familiar with the SSB selection process.
Remember that no study plan can guarantee selection. Your results will depend on your current preparation level, consistency, understanding, and performance in the examination and subsequent selection stages.
With a realistic 150-day NDA preparation strategy, you can make better use of your time and work towards your goal of joining the Indian Armed Forces.
The Lakshya Academy – We train your mind, you take the decision.
Website: www.lakshyaacademy.co.in
For course-related queries, call the student coordinator at 7827363838.
Start your preparation today and take one step closer to your defence career goal.
