Hey Ashish.

Yes, it is possible. You can take admission in a 3 year LLB course in any College/ University recognised by BCI after completion of an undergraduation in any discipline which in your case is Btech. Many people start preparing for Judicial exams while completing their law degree and attempt it after your final year. You are also eligible to do the same. Requirement for admission in most colleges in minimum aggregate of 45-55% marks in undergraduate degree. The most soughtafter entrances for 3 year law are- DU LLB, PU LLB, BHU LLB, BVP LLB, MH CET, SLAT, TSLAWCET, LSAT etc.

Best of luck.