The bachelor of arts LLB honours is a 5 year Course which you can do after 12th class. Mentioned below is the eligibility criteria for BA LLB course:

• The candidate must have completed the 10 + 2 board examination from a recognised board with any stream.
• The candidates must have achieved at least 45%  in class 12th examinations. However the percentage criteria for BA LLB  changes from college to college.
• For getting admission in one of the top colleges of India you have to clear entrance exam of the respective college. Mentioned below are some colleges along with their entrance exams:

Ramaiah College of Law - CLAT

Bharati Vidyapeeth new Law College - MH CET Law

Army Institute of law - AIL LET

Lloyd Law College - CLAT

For more information you can check the following link:

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.careers360.com/courses/ba-llb-dual-degree/amp&ved=2ahUKEwjos9vMko_yAhVe7XMBHao-D6cQFjAAegQIEhAC&usg=AOvVaw3pDhiBbCUbp73PUjnVxaQp&ampcf=1