Hello,

LLB is for a duration of three years, its eligibility criteria is passed graduation in any discipline from a recognized university with 45% marks and in case of reserved category it's 40%. Although this aggregate varies among universities like DU and BHU require minimum 50% marks while universities like Kurukshetra, Rohtak, Meerut require only 45% marks in graduation.
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Some of the top universities conduct entrance tests such as

DU LLB, conducted by Delhi University
LAT, conducted by Allahabad University
BLAT,conducted by Banaras Hindu University
LSAT, which entrance scores are accepted by many universities
TS- LAWCET- Law Common Entrance Test is conducted by colleges and universities in Telangana
AP LAWCET, conducted for admission in colleges and universities in Andhra Pradesh
MH CET LAW, conducted for admission in colleges and universities in Maharashtra.