Hello Chandu ! 

It seems that you completed B.Sc and now want to be a legal advisor. But for that you have to get into law. There are two types of degrees in Law - 5 years' LLB degree & 3 years' LLB degree. The 3 years' course you can get into after graduation. As you are already graduated, you can enroll for that. 

For details, check this link :- 

https://www.careers360.com/news/3916-legal-studies-make-career-law

Thank you