Want to serve the nation in uniform? Looking to crack NDA or CDS 2025? If you dream of becoming an officer in the Indian Army, Navy, or Air Force, then NDA (National Defence Academy) or CDS (Combined Defence Services) is your golden chance. These prestigious exams are conducted by UPSC and are the most respected ways to join India’s elite defence forces.
In this complete guide, we’ll help you understand everything—subjects, syllabus, coaching options, preparation strategy, and common doubts—in a simple, motivational tone. Whether you’re in 12th class or a graduate, this post will show you exactly how to prepare for NDA/CDS and proudly wear the uniform.
🏆 What Is NDA and CDS Exam?
NDA (National Defence Academy) is for 12th pass male candidates who want to join the Indian Army, Navy, or Air Force as officers. The selection includes a written exam + SSB interview + medicals.
CDS (Combined Defence Services) is for graduates (both male and female) and offers entry into IMA (Army), INA (Navy), AFA (Air Force) and OTA (Officers Training Academy).
Both exams are conducted by UPSC, so the level is high, but the reward is a lifetime of honour, discipline, and service.
📚 What Are the Subjects and Pattern?
- NDA Exam:
- Mathematics – 300 marks
- GAT (General Ability Test) – 600 marks (English + GK + Science + History + Current Affairs)
CDS Exam:
- For IMA/INA/AFA:
- English – 100 marks
- General Knowledge – 100 marks
- Mathematics – 100 marks
- For OTA (Women/Men): Only English + GK (no Maths)
👉 Both exams have negative marking, and selection also includes a tough SSB interview (Personality + Psychology + Group Tasks + Interview Round).
🔍 How to Start Preparing for NDA/CDS 2025?
The best time to start NDA prep is in Class 11 or 12, and for CDS, you can begin from second year of graduation. The earlier, the better.
Follow these simple steps:
- Focus on NCERT books (Class 9–12) for Science, Geography, Polity, History.
- Improve your basic maths and clear concepts—especially algebra, trigonometry, and coordinate geometry.
- Read English newspapers like The Hindu or Indian Express daily for vocabulary + current affairs.
- Take weekly mock tests to build exam temperament.
- Solve previous 10 years’ papers—most questions repeat with small changes.
- Watch motivational stories of NDA/CDS toppers—they’ll push you through your low days.
🏫 Best Coaching Platforms for NDA/CDS in India
For offline coaching, Major Kalshi Classes and Centurion Defence Academy are considered top-tier—they specialize in defence exams and offer SSB training too.
If you’re preparing online, platforms like Gradeup (now BYJU’S Exam Prep) and Testbook provide NDA/CDS-focused courses, quizzes, mock tests, and current affairs capsules.
You can also explore YouTube channels of defence coaches for free strategy sessions, interview tips, and concept explainers.
👉 Just choose one platform and follow their plan with 100% focus. Consistency matters more than switching.
❓ FAQs: What Aspirants Usually Ask
Can a girl apply for NDA?
Yes, from 2021 onwards, female candidates are also eligible for NDA. A huge step forward!
How many attempts are allowed?
For NDA, you can attempt twice a year between ages 16.5 to 19.5. For CDS, up to age 24 (27 for OTA).
Is coaching necessary for NDA/CDS?
Not compulsory. Many crack it with self-study + mock tests. Coaching helps if you need structure and guidance.
How important is SSB?
Very. Even after clearing the written exam, SSB decides your final selection. So, work on personality, confidence, and communication skills too.
What if I’m from Hindi medium?
No problem. Many NDA/CDS officers come from Hindi backgrounds. Focus on understanding concepts. Use Hindi-English mix for study.
💬 Final Words: If You’re Ready to Die for the Country, Be Ready to Prepare for It Too
Becoming a defence officer is not just about clearing an exam. It’s about becoming physically, mentally, and emotionally strong. Your journey starts with NDA/CDS, but the real transformation happens in your discipline, routine, and mindset.
Wake up early. Study smart. Practice daily. Exercise regularly. Read with purpose.
One day, your parents will say, “Mera beta / meri beti fauj mein hai.” And that feeling can’t be bought.