In general the admission process will start after the publication of the boards results (colleges that offers admission entirely on the base of the 10+2 merit). For the college/universities that conducts entrance, you will have to take those exams which will release there application forms in the month of April,2021 (in general).

Now you didn't mentioned more specific details which can help to provide you prominent information about the entrance. So you can get back to career360.com (//career360.com) with proper question specifics so that we can provide you the info you really need.

I hope this answer helps. All the very best for your future endeavors!