If you are asking about Narula Institute of Technology, the eligibility criteria is that you need atleast 45% in your class 12 if you are general category and 40% marks if you are Reserved Category. You should also have a valid score or rank in WBJEE or JEE Mains or CEE-AMPAI-WB

Since you have finished your 10th only you need to finish your 11 and 12th first with the above mentioned criteria.