CDS
Preparation for the UPSC Combined Defence Services examination for graduates.
The Examination
What is CDS Exam?
The Combined Defence Services (CDS) written exam is a national-level competitive exam conducted twice a year by the Union Public Service Commission (UPSC). It is the primary officer entry portal for graduate candidates seeking to join the Indian Armed Forces.
Both male and female graduates can apply for the written exam to secure admissions to IMA Dehradun, OTA Chennai, INA Ezhimala, and AFA Dundigal. At Rigaur Leadership Academy, we combine structured coaching in English and general studies with regular mock papers and SSB-readiness preparation to help aspirants clear the written exam and the SSB interview.
Eligibility
CDS Eligibility Criteria
To apply for the CDS exam, candidates must meet the strict age, academic, and physical conditions defined by UPSC.
Age Limits
- IMA / INA / AFA: 19 to 24 years on the course commencement date.
- OTA (Men & Women): 19 to 25 years.
Note: Unmarried status is mandatory for entry (married candidates under specific flight categories are eligible for AFA over 25 years).
Education Standard
- IMA & OTA: Graduate degree in any discipline (B.A., B.Sc., B.Com, BTech, etc.).
- INA: Degree in Engineering (B.E. or B.Tech).
- AFA: Degree in Science (with Physics & Math at 10+2) OR Engineering.
At a Glance
CDS Recruitment Highlights Matrix
| Criteria | IMA (Indian Military Academy) | OTA (Officers Training Academy) | AFA (Air Force Academy) |
|---|---|---|---|
| Age limit | 19 to 24 years | 19 to 25 years | 20 to 24 years (26 for CPL) |
| Required Education | Graduate in any stream | Graduate in any stream | Graduate with Physics & Math at 10+2 / Engineering |
| Gender | Male Only | Both Male and Female | Male Only (unmarried) |
| Attempts limit | No fixed limit (till age ceiling) | No fixed limit (till age ceiling) | No fixed limit (till age ceiling) |
| Exam Frequency | Twice a year (Apr & Sep) | Twice a year (Apr & Sep) | Twice a year (Apr & Sep) |
Selection
CDS Selection Process
The selection flow requires clearing three major phases.
- 01
UPSC Written Exam
Held offline, testing English and General Knowledge for OTA, and an additional Elementary Mathematics paper for IMA, INA, and AFA.
- 02
5-Day SSB Interview
Conducted by military selectors to evaluate leadership qualities, psychology, physical obstacles, and personal capabilities.
- 03
Medical Test & Merit
Detailed medical evaluations are conducted by a military board. Finally, the national merit list is prepared to induct selected candidates as cadets.
Written Exam
CDS Written Exam Pattern
The written exam is conducted offline using OMR sheets. The structure differs by entry.
For IMA, INA, and AFA Entries
| Subject Area | Number of Questions | Maximum Marks | Duration |
|---|---|---|---|
| English Language | 120 Questions | 100 Marks | 2 Hours |
| General Knowledge | 120 Questions | 100 Marks | 2 Hours |
| Elementary Mathematics | 100 Questions | 100 Marks | 2 Hours |
| Total Written Score | 340 Questions | 300 Marks | 6 Hours |
For OTA Entry (Men & Women)
| Subject Area | Number of Questions | Maximum Marks | Duration |
|---|---|---|---|
| English Language | 120 Questions | 100 Marks | 2 Hours |
| General Knowledge | 120 Questions | 100 Marks | 2 Hours |
| Total Written Score | 240 Questions | 200 Marks | 4 Hours |
Fitness
Physical & Medical Standards
Candidates must be in excellent physical and mental health to cope with the training. Major standards include:
- Minimum Height: For male candidates, the minimum height is 157.5 cm (162.5 cm for AFA). For female candidates, the minimum height is 152 cm.
- Visual standards: Vision must be correctable to 6/6. Myopia limit must not exceed -3.50D and Hypermetropia +3.50D for IMA/OTA.
- Physical Conditioning: Regular physical exercise during preparation helps candidates comfortably pass standard running, balance, and chin-up requirements.
The Path Ahead
Training, Salary & Career Growth
Selected cadets join their respective training institutions:
- IMA Dehradun: 18 months training leading to permanent commissions.
- OTA Chennai: 11 months training leading to short service commissions (10-14 years).
- AFA Dundigal: 74 weeks training for pilots and technical officers.
- INA Ezhimala: 18 months training for naval executive officers.
Cadets receive a monthly stipend of Rs. 56,100 during training. Upon commissioning as Lieutenants, they receive a gross salary starting at Level 10 of the 7th CPC (above Rs. 1,00,000 including MSP and allowances).
Preparation
CDS Preparation Strategy & Common Mistakes
To improve your chances of clearing the UPSC CDS examination on your first attempt, follow a structured and consistent preparation strategy.
01
Build a Strong Score in English
English is one of the most scoring sections of the CDS examination. Focus on strengthening grammar, vocabulary, reading comprehension, sentence structure, synonyms, antonyms, and error detection. Regular practice can significantly improve both speed and accuracy.
02
Strengthen General Knowledge and Current Affairs
The General Knowledge paper requires both conceptual understanding and awareness of current events. Build a strong foundation in Physics, Chemistry, Biology, History, Geography, Polity, and Economics, while following important national and international current affairs regularly.
Common Mistakes to Avoid
- Ignoring sectional qualifying requirements and focusing only on the overall score.
- Depending heavily on English while neglecting static General Knowledge and current affairs.
- Studying concepts without practising previous-year question papers.
- Attempting mock tests without following the actual examination time limits.
A successful CDS preparation strategy should combine conceptual clarity, regular revision, current affairs awareness, previous-year paper practice, and effective time management.
The Combined Defence Services Examination (CDS) is conducted twice a year by UPSC for graduates seeking entry into the Indian Military Academy (IMA), Indian Naval Academy (INA), Air Force Academy (AFA) and Officers Training Academy (OTA).
Candidates applying for the Indian Military Academy are generally required to fall within the 19–24 years age range. IMA entry through CDS is for eligible unmarried male candidates. Exact date-of-birth criteria are specified in each UPSC notification.
Candidates for the Officers Training Academy are generally required to be between 19 and 25 years of age. CDS provides OTA entry opportunities for eligible male and female candidates under the applicable eligibility conditions.
Candidates applying for the Air Force Academy are generally required to be between 20 and 24 years of age. The upper age limit may extend to 26 years for eligible candidates holding a valid Commercial Pilot Licence issued by the DGCA.
Candidates must possess a degree from a recognised university or equivalent institution. Final-year degree students may also apply subject to the conditions mentioned in the official notification.
Candidates must meet the medical, physical and visual standards prescribed for their chosen academy and service. These requirements vary between the Army, Navy and Air Force, so candidates should refer to the latest official UPSC and service-specific medical guidelines.
Request a Call Back
Speak with the Rigaur team about CDS.
Share a few details and we will help you understand the right preparation pathway.