Hey!

Each college has its own rule if any candidate fails to clear any subject of course. In most of the colleges, if candidate fails in any exam then a second chance is given to students to clear that exam again (called as backlog). So, you must ask from your college authorities or your seniors about backlog exam. Also, if candidate fails only in one exam then he/she is promoted to next semester , considering that he/she will be given another chance to clear the exam (generally).

Thankyou