Necessary things for CLAT 2021:

• Upload a recent photograph and signature as per the instructions.

• Enter personal information including the candidate's full name, father’s name, mother’s name, category, date of birth, nationality, NRI category status (if applicable).

You can visit the link below to know more about CLAT 2021:

https://law.careers360.com/articles/clat-application-form

You can visit the links for preparation strategy of CLAT 2021:

https://law.careers360.com/articles/top-10-tips-for-qualifying-clat

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