yes , after 12th many students see their carreer in law as it is one of the most  popular carreer .

so if you are seeing law as a  career then yess u can apply for the llb,,

it is 3yr course 

but u can also  with 5 yr integrated pgms that offer ba llb, bba llb, bcom llb as course,, which are chosen by most people for better futre prospectives..

so u could apply for both of them  through clat which provide you entrance into the top 20 nlu's of india and the score of clat is applicable in other private instittes also..

Thanks for the question 

Yes absolutely. 

Common law admission test is the examination for those young aspirants who want to pursue LLB 

The exam takes place in the second week of month of may every year.

Visit http://www.clat.ac.in to gather more information 

All the best