CLAT

From your question, it sounds like you're interested in classroom coaching centers. If that's the case, I'd suggest doing your homework thoroughly - there are quite a few institutes that charge hefty fees without providing anything in the name of quality. Here are some basic tips to keep in mind:
Quality of the faculty - many places hire recent Law grads who couldn't land a job or pretty much anyone else who can teach. Check that you are being taught by someone who actually knows what they're talking about and are qualified to teach
Results of the institute - however this is hard to verify because all coaching classes claim the same few students as their own, when in reality the student may have once visited the branch for a mock test or something
Your commute - if you're going to be visiting the same place for several months, it better be convenient for you otherwise you're going to be wasting a lot of time commuting.

Hi,
There is no need. CLAT is for 5-year LL.B. Programs. Below colleges are good for pursuing 3-year LLB programmes.
1. Faculty of Law, University of Delhi
2. Jindal Global Law School
3. BHU Law School
4. GLC-Mumbai
5. ILS Law College-Pune
6. IIT-Kharagpur Law School (RGSOIPL)-only for B.Tech/M.Sc graduates
7. PU, Chandigarh Law Department
8. Symbiosis Law School, Pune
9. Lucknow University Law Faculty
10. Allahabad University Law Department
11. Osmania University-University College of Law / PG College of Law
12. Tamil Nadu Dr. Ambedkar Law University Chennai/ School of Excellence in Law
13. Government. Law College, Ernakulam/Trivandram & Kozhikode
14. Andhra University Law Department, Dr. Ambedkar Law College, Visakhapatnam
15. Kurukshetra University, Kurukshetra / Maharshi Dayanand University (MDU), Rohtak
16. Gorakhpur University Law Department
17. DES Law College, Pune/ New Law College, Pune
18. Law College, Dehradun
19. Sir LA Shah Law College, Ahmedabad
20. Kerala Law Academy Law College Trivandram
21. Dr. Ambedkar Government. Law College, Chennai
22. KC Law College, Mumbai.