Do you get held back if fail semester?

Whether or not you get held back if you fail a semester depends entirely on your school's policies and the specific circumstances. There's no universal answer.

Some schools might have a specific number of failed courses or a minimum GPA required to advance to the next grade level. Others might offer summer school or other remediation options to allow you to catch up. Still others might have different policies depending on your age or grade level.

You need to check your school's academic policies, student handbook, or talk to a guidance counselor or teacher to find out the specific rules.