What happens if you fail a course?

Answer 1

Depends on the school, your grade (as in K-12 and college, not A's and B's), and even the teacher... I know it is common for schools to make you retake that course... I would talk to the teacher you are about to fail... They will know, and you may even be able to "bargain" with them and work something out.

Answer 2

When you fail math in highschool then you have to take the class over again because other wise you wont be able to graduate

It's not the end of the world to fail a class. It's really important to talk to your teacher to do two things:

First, you need to work out the areas where you have had most trouble.

Second, ask your teacher for help in catching up. All teachers will willingly spend some time with you to set up a study plan to work on weak topics. Once you have the plan, make sure you stick to it and keep talking to your teacher. Whatever grades you got the last time, you can improve them if you let your teacher help and you listen to the advice you get.