You Can Choose Any Subjects or streams for higher studies after passing 10th grade examination. Indian administrative examination does not required any particular stream to apply for IAS exam.. you can choose stream according to your interest and abilities.. after 10th you have to pass 12th grade examination , than you have to pass graduation level degree in any discipline to apply for IAS exam.

IAS exam Eligibility Criteria:
You have to pass graduation in any discipline from a well recognized university.

Age limit :
OBC candidate age limit maximum : 33 years.
The candidate must be between 21-30 years of age.
SC/ST have 5 years of age relaxation.