CDS 2026 — Combined Defence Services Preparation Guide

IMA, INA, AFA, OTA Officer Entry — Syllabus, Salary, AI Mock Tests

🚀 Mocks launching in 2-3 weeks — join the waitlist below

The Union Public Service Commission Combined Defence Services Examination (UPSC CDS) is the graduate-level officer entry route for the Indian Armed Forces. Conducted twice a year (CDS 1 in February and CDS 2 in September), CDS recruits candidates for the Indian Military Academy (IMA, Dehradun), Indian Naval Academy (INA, Ezhimala), Air Force Academy (AFA, Hyderabad), and Officers Training Academy (OTA, Chennai — for Short Service Commission). Approximately 4-5 lakh candidates apply each cycle (8-10 lakh annually) for around 350-450 vacancies. With Bachelor's degree eligibility and direct entry to officer-level training, CDS is the preferred route for graduates seeking a defence career — particularly for those who missed NDA in their 12th year. Starting stipend during training is ₹56,100, with Pay Level 10 plus Military Service Pay after commissioning. This guide covers the complete CDS 2026 syllabus, eligibility, exam pattern, SSB process, salary, and AI-powered preparation strategy.

Eligibility Criteria

Age Limit: IMA: 19-24 years. INA: 19-22 years. AFA: 20-24 years (with valid Commercial Pilot License: 26 years). OTA (men): 19-25 years. OTA (women): 19-25 years. (As on cut-off date specified in notification.)
Educational Qualification: For IMA and OTA: Bachelor's degree in any discipline from a recognized university. For INA: Bachelor's degree in Engineering. For AFA: Bachelor's degree with Physics and Mathematics at 10+2 OR Bachelor's in Engineering. Final-year students may apply provisionally and must produce degree certificates before joining the academy.
Nationality: Unmarried (for IMA, INA, AFA). OTA women candidates can be married with at least 18 months of marriage. Indian citizen, or subject of Nepal/Bhutan, or Tibetan refugee who came to India before 1962, or Indian-origin migrant from specified countries.
Number of Attempts: No specific attempt limit; candidates can apply within age eligibility window. Most candidates get 4-7 attempts across both annual CDS cycles within the age window.

Exam Pattern

Stage	Mode	Duration	Marks
Written Examination — IMA/INA/AFA	Pen-Paper (OMR)	2 hours per paper × 3 papers (6 hours total, conducted across one day)	300
Written Examination — OTA	Pen-Paper (OMR)	2 hours per paper × 2 papers (4 hours total)	200
SSB Interview	In-person (5 days)	5 days	300
Medical Examination	In-person	3-5 days	Qualifying

Written Examination — IMA/INA/AFA sections: Paper I — English (100 Q / 100 marks). Paper II — General Knowledge (100 Q / 100 marks): History, Geography, Polity, Economy, Science, Current Affairs. Paper III — Elementary Mathematics (100 Q / 100 marks). Negative marking: 1/3 mark per wrong answer.

Written Examination — OTA sections: Paper I — English (100 Q / 100 marks). Paper II — General Knowledge (100 Q / 100 marks). NO Mathematics paper for OTA. Negative marking: 1/3 mark per wrong answer.

SSB Interview sections: Same 5-day structure as NDA SSB. Stage 1 (Day 1): screening test (OIR + PP&DT). Stage 2 (Days 2-5): Psychology Tests, Group Testing tasks, Personal Interview, Conference. Total CDS selection marks: Written + SSB = 600 (for IMA/INA/AFA) or 500 (for OTA).

Medical Examination sections: Detailed medical exam by Armed Forces Medical Services. Vision standards, hearing, height, weight proportionate, no permanent injuries, dental fitness. Air Force Academy medical is the strictest (6/6 vision without spectacles required).

Detailed Syllabus

English (Paper I)

Reading Comprehension (long 600-800 word passages with inference questions)
Spotting Errors (advanced grammar — tenses, prepositions, conjunctions, subject-verb agreement)
Sentence Arrangement and Para Jumbles
Synonyms and Antonyms (12th-graduate level vocabulary)
Fill in the Blanks (single and double-blank questions)
Cloze Test (paragraph-based vocabulary and grammar)
Sentence Improvement (replacing underlined parts)
Idioms and Phrases (commonly used English idioms)
Spelling Correction
Active/Passive Voice and Direct/Indirect Speech transformations

General Knowledge — History (Paper II)

Ancient Indian History (Indus Valley Civilization, Vedic period, Mauryan and Gupta empires)
Medieval Indian History (Delhi Sultanate, Mughal Empire, Vijayanagara, Maratha rise)
Modern Indian History (British colonial rule, 1857 Revolt, Reform movements)
Indian Freedom Struggle (Congress, Gandhian movements, Partition, key personalities)
Post-Independence India (integration of princely states, India-Pakistan wars, Emergency, liberalization)
World History (Renaissance, Industrial Revolution, World Wars, Cold War, Decolonization)

General Knowledge — Polity & Constitution (Paper II)

Indian Constitution (Preamble, Fundamental Rights, Directive Principles, Fundamental Duties)
Parliamentary system (Lok Sabha, Rajya Sabha, President, Prime Minister, Council of Ministers)
Judiciary (Supreme Court, High Courts, judicial review, PIL)
Constitutional bodies (Election Commission, UPSC, CAG, Finance Commission)
Federal structure (Centre-State relations, financial relations)
Local self-government (Panchayati Raj, Urban governance — 73rd and 74th Amendments)

General Knowledge — Geography & Economy (Paper II)

Indian Geography (Physical features, Climate, Natural resources, Agriculture, Industries, Population)
World Geography (Continents, Oceans, Major countries, Climate zones, Time zones)
Indian Economy (Planning, Banking, Agriculture, Industry, Trade, Recent reforms)
Budget and Economic Survey highlights
Government schemes (PMJDY, MUDRA, PMFBY, Stand-Up India, etc.)
International Economic Organizations (IMF, World Bank, WTO, ADB)

General Knowledge — Science & Current Affairs (Paper II)

General Science (Physics, Chemistry, Biology — Class 10-12 level)
Defence Affairs (recent military operations, Indian Armed Forces structure, ranks)
Indigenous weapons systems (Tejas, Arjun, INS Vikrant, BrahMos, Akash)
DRDO recent projects and successful tests
Current Affairs (national, international, defence — last 6-12 months)
Space programs (ISRO missions like Chandrayaan, Aditya-L1, Gaganyaan)
Sports (Olympics, Asian Games, Commonwealth, World Cups), Awards, Books, Authors

Elementary Mathematics (Paper III — IMA/INA/AFA only)

Arithmetic (Number System, Fractions, HCF, LCM, Decimals, Square Roots, Surds)
Percentage, Profit and Loss, Discount, Simple and Compound Interest
Time and Work, Time and Distance, Pipes and Cisterns
Ratio and Proportion, Mixture and Alligation, Partnership
Algebra (Linear and Quadratic Equations, Polynomials, Logarithms)
Trigonometry (Trigonometric ratios, Identities, Heights and Distances)
Geometry (Lines, Triangles, Quadrilaterals, Circles, Polygons, Solid Geometry)
Mensuration 2D and 3D (Area, Volume, Surface Area of standard shapes)
Statistics (Mean, Median, Mode, Standard Deviation, Frequency distribution)
Coordinate Geometry basics (distance formula, slope, line equations)
Sets and Venn Diagrams
Probability (basic — independent events, conditional probability)

Salary & Benefits

Pay Level: During Training: ₹56,100 stipend per month. After Commissioning: Pay Level 10 (Lieutenant equivalent) with Military Service Pay (MSP)
Basic Pay: ₹56,100 per month after commissioning + ₹15,500 MSP
Gross Salary: ₹1,10,000 – ₹1,30,000 per month after commissioning (including DA, MSP, allowances)
In-Hand Salary: Approximately ₹85,000 – ₹1,05,000 per month after deductions for fresh Lieutenants
Other Benefits: Same as NDA-commissioned officers: DA (~50%), MSP (₹15,500), Field/High Altitude/Counter-Insurgency Allowances (substantial), Free rations, Free uniform & maintenance allowance, Subsidized accommodation in Cantonment, CSD canteen access, Free medical (ECHS for self and family), Pension after 20 years of service, AGIF group insurance, Travel concessions for self and family, Children's education allowance, Post-retirement settlement plot/loan benefits

Important Dates

Notification Release: CDS 1 2026: Released December 2025. CDS 2 2026: Expected May-June 2026
Application Deadline: Per notification (typically 21 days after release)
Tier 1 Exam: CDS 1 2026 Written: 8 February 2026. CDS 2 2026 Written: 6 September 2026
Tier 2 Exam: SSB Interview: 4-6 months after written result
Result: Final result with SSB merit: 8-10 months after written exam

CDS is conducted twice a year. Verify dates with upsc.gov.in.

Preparation Strategy

CDS English (Paper I) is significantly tougher than SSC/IBPS English — expect 600-800 word reading comprehension passages with inference questions. Daily reading of The Hindu editorials and one classic English novel per month builds the required depth. Aim to learn 30+ new words per week with usage.
CDS Mathematics is at Class 10 level — significantly easier than NDA. Master Class 8-10 NCERT cold; advanced topics like calculus and vectors are NOT in CDS syllabus. Focus on accuracy and speed in Arithmetic, Algebra, Geometry, Mensuration.
GK paper rewards depth over breadth — 100 questions covering History, Geography, Polity, Economy, Science, Defence affairs. Allocate 60% of GK prep time to History (especially Modern Indian History) and Defence Affairs as these have highest weightage in CDS.
Defence Affairs is unique to CDS and high-yield — recent military exercises, indigenous weapons (LCA Tejas, Arjun MK-2, INS Vikrant, Pinaka), DRDO projects, foreign defence deals, and Armed Forces structure. Most candidates underprepare this and lose 10-15 marks they could have scored. Read defence magazines (Force, Vayu Aerospace, Indian Defence Review).
For OTA candidates (no Math paper) — use the saved time to go deeper into English and GK. OTA cut-offs are often higher because of the smaller paper. SSB preparation is identical to IMA/INA/AFA candidates.
Start SSB preparation 2-3 months before written results — develop officer-like qualities (OLQs): communication, leadership, decision-making, physical fitness, current awareness. CDS-cleared candidates have higher SSB success rate than NDA (more mature, graduate-level confidence and experience).
Physical fitness matters — aim for 2.4 km run in under 11 minutes, 20 push-ups, 10 pull-ups, basic swimming. Medical standards are strict for AFA (6/6 vision required); get a pre-SSB medical checkup at any Armed Forces hospital to identify disqualifying conditions early.

Frequently Asked Questions

What is the CDS 2026 exam date?

CDS 1 2026 written exam was conducted on 8 February 2026. CDS 2 2026 written exam is scheduled for 6 September 2026. Each cycle's notification typically releases 3-4 months before the exam at upsc.gov.in. SSB Interviews follow 4-6 months after written results, with final results in 8-10 months.

What is the eligibility for CDS?

For IMA and OTA: Bachelor's degree in any discipline. For INA: Engineering degree. For AFA: Bachelor's with Physics and Math at 12th OR Engineering degree. Age varies by academy: IMA 19-24, INA 19-22, AFA 20-24, OTA 19-25 (men and women). Marital status: unmarried for IMA/INA/AFA; OTA women can be married with at least 18 months of marriage.

What is the difference between CDS and NDA?

NDA is for 12th-pass candidates (16.5-19.5 years) leading to Army/Navy/Air Force, with 3-4 years of pre-commission training at NDA Khadakwasla. CDS is for graduates (19-25 years), with 1.5-3 years of training (depending on academy: IMA 18 months, INA 38 months, AFA 18 months, OTA 49 weeks). NDA has 270-question written, CDS has 200-300 questions. NDA opens defence career earlier (commissioning at ~22), CDS at ~25-26. Both lead to identical officer rank and salary post-commissioning.

Can female candidates apply for CDS?

Yes. Female candidates can apply for OTA (Officers Training Academy) for Short Service Commission. The 2023 Supreme Court ruling extended permanent commission opportunities for women in IMA, but as of 2026, female candidates apply primarily through OTA route via CDS. Some specialized branches in INA and AFA also accept female candidates with permanent commission.

What is the salary of a CDS-recruited officer?

During the 1.5-3 year training, cadets receive ₹56,100 stipend per month. After commissioning as Lieutenant/Sub Lieutenant/Flying Officer, salary is Pay Level 10 with ₹56,100 basic + ₹15,500 Military Service Pay + DA + allowances, totaling approximately ₹1,10,000-1,30,000 gross per month, similar to NDA-commissioned officers. Field Area and Counter-Insurgency postings carry additional ₹20,000-40,000 per month.

How many attempts are allowed for CDS?

No specific attempt limit. Candidates can apply for as many CDS cycles as they want, as long as they fall within the age eligibility for the chosen academy (typically 19-25 years). Most candidates get 5-7 attempts across both annual CDS cycles within the age window.

How does SarkariRise help with CDS preparation?

SarkariRise offers AI-powered CDS preparation with English, GK, and Math (or English+GK for OTA) mocks matching UPSC pattern, defence-specific current affairs digest, AI doubt-solving in Hindi/English, dedicated reading comprehension practice with long passages, and detailed SSB preparation guidance. Free tier provides 2 mocks per day; Pro at ₹199/month unlocks unlimited CDS mocks plus AI study plans aligned with the IMA/INA/AFA/OTA target academy.

Disclaimer: SarkariRise is a private exam preparation platform and is not affiliated with the Staff Selection Commission, Government of India, or any official recruitment authority. Always verify official notifications and dates from the respective official websites.