What is the Difference Between NDA and CDS?
Many defence aspirants often get confused between National Defence Academy Examination (NDA) and Combined Defence Services Examination (CDS). Both exams are conducted by Union Public Service Commission (UPSC) and provide an opportunity to join the Indian Armed Forces, but they differ in eligibility, age, education level, and career stage.
Let’s understand What is the Difference Between NDA and CDS? clearly.
Educational Qualification
NDA
For students who have passed or are appearing in 12th class
For Air Force & Navy: 12th with Physics & Mathematics
Entry at an early stage (after school)
CDS
For candidates who have completed Graduation
Any stream for IMA & OTA
Engineering required for Navy
Graduation with specific subjects for Air Force
Main Difference:
NDA is after 12th, CDS is after Graduation.
Age Limit
NDA
16.5 to 19.5 years
CDS
19 to 25 years (varies slightly by academy)
Main Difference:
NDA candidates are younger; CDS candidates are graduates.
Training Academy
NDA
Selected candidates first train at:
National Defence Academy (Pune)
After 3 years, they move to respective academies:
IMA (Army)
INA (Navy)
AFA (Air Force)
CDS
Candidates directly join respective academies:
Indian Military Academy (IMA)
Officers Training Academy (OTA)
INA
AFA
Main Difference:
NDA includes 3 years of joint training before specialization.
CDS candidates go directly to their service academy.
Exam Pattern
NDA Exam
Mathematics
General Ability Test (GAT)
After written exam → SSB Interview
CDS Exam
English
General Knowledge
Mathematics (Not for OTA)
After written exam → SSB Interview
Career Entry Stage
NDA
Entry at a younger age
Longer training period
Ideal for students clear about defence career early
CDS
Entry after completing graduation
Shorter training duration
Suitable for graduates who decide later
Quick Comparison Table
| Feature | NDA | CDS |
|---|---|---|
| Conducted By | UPSC | UPSC |
| Qualification | 12th Pass | Graduate |
| Age Limit | 16.5 – 19.5 | 19 – 25 |
| Training Start | NDA Pune | Direct Academy |
| Career Stage | After School | After Graduation |
Both NDA and CDS are prestigious pathways to become an officer in the Indian Armed Forces.
✔ Choose NDA if you want to join right after 12th.
✔ Choose CDS if you want to join after graduation.
Your choice depends on your age, education level, and when you decide to pursue a defence career.