HELP WITTY GIRLS!!!

So I am a sophomore in honors American Literature in high school.
My parents are very proud of my honors classes.
This year they are doing an experiment with my class with ipads to do work. Everything is soooo confusing. We have about 10 different apps and websites we have to use just to submit homework! It's so crazy and half the time my internet crashes!!!
Anyway, we have "PowerSchool" which is a way for parents to check grades online.
My parents saw my '96' in American Literature and were soooo proud of me. I thought I was doing good in that class because of the 96. So I haven't really bothered with that class.
Turns out my teacher just hasn't entered any grades in.
I found a way to check my grades on one of the websites we submit homeowrk to. I have a 68. I feel like crying soooo hard. My grades come out on Friday and my parents will kill me! I HAVE NO CLUE WHAT TO DO! PLEASE HELP ME!!!!!!!!!