Dear Virender, there are 2 LLB programmes. One is 5 year LLB and another is 3 year LLB. You will have to apoear for CLAT for both of them. 

For 5 year LLB entrance exams the criteria is that any student who has passed with an aggregate of 50% for general category, 45% for reserved categories or has appeared for Class 12 is eligible to write CLAT and other entrance examinations.

For 3 year LLB entrance exams, the criteria is that the candidate should be atleast 17 years of age on the date of application. There is no upper age limit. A graduation degree with a minimum aggregate of 45% for general category and 40% for reserved categories is the basic qualification required. Universities like DU  and BHU require minimum of 5p% marks while Universities like Kurukshetra, Rohtak, Meerut require only 45%.