Hi Laxmi,

BA LLB course from Calcutta University is a 5 Year course. The admission is purely on merit as assessed through an admission test conducted by the calcutta university. The eligibility criteria is 10+2  from an educational institute recognized by the Educational Authority of Central or State Government.

In the below links you can find course and college details 

https://www.careers360.com/colleges/george-school-of-law-hoogly/ba-llb-course

https://www.careers360.com/university/university-of-calcutta-kolkata

Hope this helps you.

Good Luck!!