After 12th Science, you can do under graduation in various streams so the exams in which you will need to appear depends on the field in which you want to enter. And let me tell you one thing if you are looking forward to doing under graduation from this session only you are very late as almost all of the exams conducted for various fields have already been conducted and seat allotment counselling is about to start pretty soon. Now you will have only chance to go into the colleges which gives admission on the basis of 12th percentage. But if you are looking forward to taking a 1-year drop and then do graduation then you will need to tell us in which field you want to go then I will recommend you the exams for which you need to start your preparations.

Feel free to ask if you have any more queries. All the best!!