CDS Exam Guide

Quick Overview

CDS Exam: Overview

The Combined Defence Services pathway lets qualified graduates compete for officer training across India. It is a national selection run by the Union Public Service Commission, India’s central service commission for recruitment to officer posts.

What the selection process involves

Your written score is the first filter. High scorers get shortlisted for SSB interviews and then must clear medicals to make the final merit list.

Training academies you can target

You can aim for IMA, INA, AFA or OTA. Each leads to distinct careers in the Army, Navy, Air Force or Short Service Commission. Pick academies based on your qualification: engineers may favour naval entry, while physics or maths help AFA eligibility.

How the two sessions work

There are two sessions each year — commonly called CDS 1 and CDS 2 — so you get two attempts within the eligible age window. Treat preparation as year‑round; using both chances can improve your odds.

• Why structure matters: your paper choice affects cut‑offs and SSB call‑ups.

Practical tip: plan a steady study routine rather than last‑minute cramming.

Eligibility Criteria

CDS Exam: Eligibility criteria [nationality, age limit and education]

Check your nationality, age and academic records carefully — small mismatches can disqualify you. Before you fill the form, confirm every eligibility point on the official notification.

Nationality rules you must meet

You must be a citizen of India, or a subject of Nepal or Bhutan. Certain Tibetan refugees (who came before 1 January 1962) and persons of Indian origin residing in specified countries may also qualify. Verify your status early so you do not lose time.

Age limits by academy

Different academies have different age limit windows. For IMA and INA the birth range is 2 Jan 2003 to 1 Jan 2008 for unmarried male candidates. AFA candidates normally need to be 20–24 years as on 1 Jan 2027 (with DGCA CPL relaxation up to 26 years in specific cases).

Educational qualifications

IMA and OTA require a degree from a recognised university. The indian naval entry expects an engineering degree. The air force route asks for a degree with Physics and Maths at 10+2 level or an engineering qualification.

Marital status, final‑year candidates and key checks

IMA, INA and AFA usually accept only unmarried male candidates. OTA accepts unmarried men and women; certain exceptions for widows/divorcees may apply. You may apply in your final year, but you must produce proof of graduation when asked during document verification.

Eligibility is non-negotiable — a high written score will not help if you fail a basic check.

Syllabus

CDS Exam: Exam Pattern 

Know the paper layout and timing before you walk into the hall; it shapes every strategy you use.

Written format for IMA, INA and AFA candidates

You face three objective papers: English, General Knowledge and Elementary Mathematics. Each paper is 100 marks and lasts 2 hours.

Written format for OTA candidates

OTA has two objective papers: English and General Knowledge. Both are 100 marks with a 2‑hour duration each.

MCQs, negative marking and practical strategy

All papers use multiple‑choice questions. For every wrong answer, one‑third mark is deducted. This changes how you guess.

• Pacing rule: first pass — answer all sure questions; second pass — attempt moderate ones; final pass — pick safe guesses.

• Mock tests should mirror the exact paper duration and marking scheme to train speed and accuracy.

• Smart selection beats blind attempts: avoid wild guessing and use educated guesses when two options look likely.

"Practice with the same pattern and negative marking; it trains judgment under pressure."

CDS Exam: Syllabus

Treat the syllabus as a roadmap: clear buckets for English, general knowledge and mathematics make revision efficient. Start by making a short checklist for each paper and mark topics as you practise.

English focus areas

Concentrate on reading comprehension, vocabulary and core grammar. Expect questions on error spotting, sentence improvement, cloze tests and ordering of sentences.

General Knowledge focus areas

Cover current affairs, Indian polity, modern and ancient history, physical and human geography, economy basics and general science. Add a weekly update slot for defence‑related news.

Elementary Mathematics focus areas

Study arithmetic, algebra, geometry, trigonometry, mensuration and statistics at 10+2 level. Prioritise high‑return topics like percentages, ratio, quadratic equations and coordinate geometry.

• Practical tip: build a topic‑mastery tracker to log completed topics, weak areas and past‑paper questions.

Note: your chosen academy affects whether you sit the maths paper, so align study load to your target.

Selection Process

CDS Exam: Selection Process

After you clear the written cut‑off, the next and decisive stage is the SSB interview and medical review. This part of the selection process evaluates who you are, not just what you know.

How the SSB evaluates officer‑like qualities

How the SSB interview evaluates officer-like qualities

The SSB looks for officer‑like qualities (OLQs): leadership, team spirit, decision‑making, communication and emotional stability. Your everyday reactions and clarity of thought matter as much as any factual knowledge.

What to expect from psychology tests, GTO tasks and the personal interview

The SSB structure includes psychology tests, Group Testing Officer (GTO) tasks and a personal interview.

• Psychology tests check consistency, honesty and thought patterns. Practise clear, truthful answers.

• GTO tasks judge teamwork, planning and field conduct. Rehearse group communication and role clarity.

• The personal interview assesses motivation, background and situational judgement. Be concise and self‑aware.

Medical examination and why physical standards matter

After a successful SSB, you face medicals to confirm fitness. Doctors check general health, eyesight, height/weight and mental well‑being.

Physical standards influence final selection because service life demands sustained fitness and resilience.

"Final selection is the combined outcome of written score, SSB recommendation and medical fitness."

Start SSB readiness alongside your written preparation so you do not begin from zero after results. Treat the selection process as three linked stages and prepare all of them equally to improve your chances.

How many attempts you should plan for in 2026

Treat each attempt as a learning cycle. There is no fixed cap on how many times you may appear — your practical limit is the age and eligibility window for your chosen academy. Plan around that window, not a number.

Using CDS 1 and CDS 2 to maximise your chances within the age window

Because the selection runs twice a year, you get two chances in the same year. Use the first sitting to identify weaknesses under real conditions. Then sharpen those areas before the second date.

Smart re-attempt planning based on results timelines and cut-offs

Expect results from the first sitting within about 15–20 days. As soon as you have your score, diagnose gaps and set a focused revision plan. Prioritise topics that cost the most marks.

• Aim above minimal cut‑offs: cut‑offs vary by paper and academy; target a safe margin rather than the bare minimum.

• Align calendars: schedule mocks, revision cycles and application deadlines so you have measurable improvement before the next date.

• Decide to re‑attempt if: your score gap is small, you can fix weak areas in time, and your age window still allows another full cycle.

Smart planning means better attempts, not just more attempts.

How to Apply

CDS Exam: How to apply online

Applying online is a two-stage process that you should complete carefully on upsconline.nic.in. Start early so you can pick your preferred centre and avoid busy windows.

Step-by-step UPSC registration: Part I and Part II

Part I asks for basic personal details — name, date of birth, email and mobile. Enter names exactly as on your ID and check spellings.

Part II is where you upload a recent photo and signature, choose academy preferences, pick an exam centre and pay the fee. Review every field before final submission.

Application fee rules and exemptions you can use

The fee is Rs. 200 for most candidates. Female and SC/ST candidates are exempt. You can pay via SBI cash, SBI net banking or Visa/Master/RuPay cards.

Choosing your exam centre and saving your confirmation page

Choose your centre early — popular cities fill fast and centre choice affects travel on the day. After submission, download the confirmation page and payment receipt and store them safely.

• Checklist: correct spelling as per ID, clean photo/signature, valid email/mobile and final review before submit.

• Your academy choices determine which written paper(s) you will face, so align selections to your study plan.

"Save the confirmation page and payment proof — they are your record for later correspondence."

All Details

Conclusion

Wrap up your preparation by locking in dates, documents and a steady practice routine that builds real gains. Note the UPSC runs the selection twice a year; the first sitting is on 12 April 2026 with notification issued 10 December 2025 and the second is expected on 13 September 2026 with a 20 May notification.

Confirm your eligibility, apply on upsconline.nic.in and watch updates on upsc.gov.in. Balance daily English and GK drills, add maths if relevant, and schedule weekly mocks that mimic the exam pattern and negative marking.

Prepare SSB skills and medical fitness alongside written work. Choose your path — Indian Military, Indian Naval, Air Force or Officers Training — based on qualifications and long‑term goals. Use both attempts if eligible and stay consistent; steady practice beats last‑minute bursts.