Hello,

CLAT is for integrated law courses such as BA-LLB/BCom-LLB/BBA-LLB to name a few for a duration of five years, and it's eligibility criteria is passed 10+2 from a recognized board securing 45% aggregate, CLAT isn't conducted for three years LLB for which the eligibility criteria is passed graduation in any discipline from a recognized university securing 45%-50% aggregate, now if  you're in 12th standard or appearing in the same, then consider integrated law course, there are various entrance tests regarding this such as CLAT/LSAT/AILET/BLAT/LFAT to name a few, in some cases admission is also based on the merit of the qualifying examination.

on the other hand if you're already a graduate or in the final year you can consider LLB for a duration of three years, for that you can appear for DU LLB/BHU UET/LAT or we also have state level law exams such as AP LAWCET/TS LAWCET/KLEE/MAH CET LAW etc, admission can also be based on the merit of the qualifying examination as in case of TNDALU.