Hey Udesh.

WBNUJS, Kolkata does not provide the course of Bcom LLB. It provides admission to two 5 year integrated law courses- BA LLB and BSC LLB. If you wish to apply for these then you need to take the CLAT exam. Admission is done here only through your marks and rank in CLAT. The application process for CLAT has already started and will last till March, 2019.

You can use the link below for any other details.

https://law.careers360.com/exams/clat

Best of luck!