OTA or IMA: short service and permanent commission

If you want to be an Army officer through CDS, there are two doors: the Indian Military Academy at Dehradun and the Officers Training Academy at Chennai. Both commission you as a Lieutenant. Both put soldiers under your command on your first posting. The differences lie in the exam you sit, the length of training, and above all the terms of the career that follows.

Candidates often decide this on one factor: OTA has no maths paper. That is a fair consideration, but it is only one of several. This guide lays them all out side by side, then gives you a way to decide.

Side by side

The exam difference

For IMA you sit three papers. For OTA you sit two, and your OTA written score is out of 200.

That changes the arithmetic of preparation. A candidate aiming only at OTA can give the maths hours to English and GK, which together make up the whole written score. A candidate aiming at both sits all three papers, and UPSC calculates the OTA score from English and GK alone.

Written cut-offs are set separately for each academy and move every cycle, so do not assume OTA is "easy". Because the OTA total is smaller, it is more useful to think in percentages. A hypothetical candidate who scores 60 in English and 55 in GK has 115 of 200 for OTA, which is 57.5 per cent. To hold the same 57.5 per cent for IMA, the candidate needs 172.5 of 300, which means about 57 or 58 in maths as well. If maths is weak, the IMA total drags; if maths is strong, it pulls the total up.

Short service and permanent commission

• Permanent commission (IMA) is built as a full career. You can serve until the retirement age for your rank, with promotion through selection boards to senior ranks.
• Short service commission (OTA) is built around a fixed term. Under the rules of recent years that term has been ten years, extendable by up to four more. Eligible officers can be considered for permanent commission, subject to vacancies, performance and the rules in force.

What each path suits

Who might prefer IMA

• Candidates set on a lifelong Army career with a clear route to senior command.
• Candidates comfortable with Class 10 maths under time pressure.
• Candidates within the IMA age window who want the longer, fuller training.

Who might prefer OTA

• Candidates who want Army experience and leadership for a defined period, then perhaps a second career.
• Candidates past the IMA age limit but within the OTA window.
• Women candidates, for whom OTA has long been the CDS route into the Army.
• Candidates for whom maths is a real barrier, provided the career terms also suit them.

Thinking the choice through honestly

Ask yourself three questions, in this order:

1. What career length do I want? If you see yourself in uniform at 50, permanent commission fits. If you want a decade of service and then something else, short service fits, with the option of trying for permanent commission.
2. What am I eligible for? Check your birth date against both windows. A candidate who is too old for IMA has already had the question answered.
3. What can I realistically score? Take one full previous-year paper in each subject. If your maths score is far below your English and GK, you have a decision: fix maths over the next few months or focus on OTA.

Talk to serving or retired officers from both paths if you can. Most will tell you the day-to-day work of a young officer looks very similar in either case.

At the SSB, you may be asked why you chose a particular entry. "Because OTA has no maths" is honest but thin. "I want to lead soldiers and I see this as a ten-year commitment, after which I plan to..." shows that you understand the path.

Applying for both

Many candidates list IMA and OTA together. This is sensible if you would genuinely accept either:

• You sit all three papers.
• You may clear the cut-off for one academy and not the other.
• Your preference order decides which one you are allotted if you qualify for both.

Preparation overlaps heavily. The only difference is maths. If you list both, do not let maths drift on the assumption that OTA is your safety net; a stronger maths score helps your IMA chances and costs your OTA score nothing.

A four-week decision plan

Quick check

1. How many papers does an OTA-only candidate sit? Two: English and GK.
2. What is the final merit total for OTA? 400: 200 written plus 200 SSB.
3. What rank do IMA and OTA graduates hold on commissioning? Lieutenant, in both cases.
4. A candidate lists IMA and OTA. Is maths counted in the OTA score? No. OTA uses English and GK only.

For the wider picture of all four academies, read what each academy offers, and for the marks that decide selection, see how CDS merit and cut-offs work.