Test today

I have the first important test for my AP Biology class today. I studied for it the night before with my mom, but I only gave her half of the study guide because it was too long and I didn't want to be there forever. I now realize that was a mistake because now I am stressing about not knowing everything for it. I go down to the support room to take it and I'm just scared that some random shit we never learned is going to be on it. I already took a math test this week and I got a 79, which is a C+. A terrible grade by my parents and I's standards. I'll get my phone taken away if I do bad on this test so I'm dreading my grade. Ultimate yikes.