OK, this is coming from a math teacher in a college prep school.
Deep breaths… it will all be OK.
You’re not a “complete failure.” You’re… brace yourself… human.
I’m glad you asked what you can do, because THAT shows me what kind of a kid you are. You’re not whining that it was unfair, that you deserve better, that the teacher is bad or that the other kids had some sort of an unfair advantage. You’re asking what YOU can do to pull up your grade.
In my book, that means you’ll find your way.
So take a look at your tests for the semester. Where did you go wrong?
Did you rush through them and make careless errors? Did you not get the basic concepts? How much time and effort did you put into the homework? When you realized you were in trouble, what did you do?
You’re a high school kid taking a college course. It’s entirely possible that you simply were not ready for AP Calc, and that next year it will be your easiest course.
The one problem with these forums is the incredibly high number of kids who are either brilliant or claim to be. And it can make a normal human feel unworthy, stupid and a whole host of words you’ve probably called yourself already.
Let me repeat my main advice: Deep breaths. It will all be OK.