Law Entrance Exam

The eligibility criteria of CLAT 2021 is given below. Eligibility :
1. There will be no upper age limit for UG Programme in CLAT 2021.
2. As regards minimum percentage of marks in the qualifying examination (I. e. , 10+2 or an equivalent examination), the candidates must have secured:
I) Forty five percent (45%) marks or its equivalent grade in case of candidates belonging to General / OBC / PWD / NRI / PIO / OCI categories. Ii) Forty Percent (40%) marks or equivalent in case of candidates belonging to SC/ST categories.
3. Candidates who are appearing in the qualifying examination in March/April, 2021 are also eligible to appear in CLAT 2021 examination. However, they shall be required to produce an evidence of their passing the qualifying examination at the time of admission, failing which they shall lose their right to be considered for admission. So from above you can do the 12th in any stream as per your interest. However 12th with Science with PCM is recommendable here.

No, clearing CLAT will only make you eligible for admission to national law universities. You will need to fulfill all the eligibility requirements of NLU you want to take admission in.
Many Private Universities take their own entrance exams for admission in law.
You may directly apply to these Universities and sit for the entrance exams.
Some of the best Universities in India are-
IILM University, Gurugram
O.P Jindal University, Sonipat
Guru Gobind Singh Indraprastha University, Delhi
Lovely Professional University, Punjab
University of Mumbai, Mumbai
Symbiosis Law School, Pune
Chandigarh University, Chandigarh
National Law University, Orissa
Indore Institute of Law, Indore