hey,

yes you can make your career in field of law if you are interested in the same , to pursue law right after your 12th , you need to go for integrated courses of law like BBA LLB, BA LLB , BSC LLB etc, that will be of 5 years and the basic eligibility to get admission the same course you are required to secure a minimum aggregate of 45 percent marks in your 10+2  and there are colleges also who provide admission on the basis of entrance exam.

if you want to do LLB , then you are required to hold a bachelors degree in any discipline from recognized board.

hope this helps!

good luck