Hello there. Hope you are doing good. I would like to tell you that most of the colleges have a provision for re-appearing in your internal exams if you have scored less or in some cases if you are absent stating a valid reason. You can check for improvement test with your faculty and can re-appear in the same. The rules and policies varies from college to college. So, you can check with the student affairs department of your college or your faculty, whichever is feasible to you.

I hope you found this answer helpful. Good luck for your future.