which aubject we should choose in BA for CDS and AFCAT exam

Hello,

First of all coming to CDS posts only female candidates are only eligible for OTA for which the eligibility criteria is passed graduation in any discipline from a recognized university are eligible to apply, age limit is between 19-25 years, those in final year of graduation too are eligible to apply, visit our page at https://competition.careers360.com/articles/cds-eligibility-criteria
to know more details regarding this,

coming to AFCAT there are recruitment done for flying and non-flying branches

Flying Branch: Aspirants must have qualified 10+2 with 60% in Maths and Physics and graduated in any discipline BE/BTech/Cleared section A and B exam of Associate Membership of Institution of Engineers (India) or Aeronautical Society of India with 60%

Non-Flying Branch are as follows:

Administrative & Logictics: Graduate Degree from a recognized university securing 60% aggregate or

Passed section A & B examination of Associate Membership of Institution of Engineers (India) or Aeronautical Society of India from a recognized university with a minimum of 60% marks or equivalent.

Accounts: Passed B.Com Degree from a recognized university with a minimum of 60% marks or equivalent.

Education: Passed
MBA/ MCA or MA/ MSc degree in Computer Science/ IT/ Management/ Physics/ Mathematics/ Chemistry/ Statistics/ International relations/English / International Studies/ Defence Studies/ Psychology/  Mass Communication/ Journalism/ Public Relation securing  50% aggregate

Now, if you are pursuing BA Programme then you're only eligible for administrative and logistics post, and if you pursue post graduation ahead in future that will make you eligible in the domain of education.