Hello Aspirant

In order to get admission into IIT or any engineering college, you should have 5 subjects in your 12th class with a science stream (Physics, Chemistry, Math, CS/IP) which is compulsory.  You should have passed 12th grade from a UGC-recognised Board of Education with an aggregate percentage of 50% or 60% for major IITs.

Since you are fulfilling all the criteria, you are eligible to appear for JEE Mains and Advance. They just need you to have Physics, Chemistry, and Math in your 12th grade, they don't bother with other subjects. Unless you wish to do Engineering in a Computer science field, you are good to go. If you want to do BTech from CS, this will be a problem since you don't have Computer Science in your 12th class.