Worried about grades in summer?

I am so worried what i will get on my report card. I got a 80 a while ago and it was the only science test i took in the quarter. Only 2 wrong too! I do all my homework and participate in class, and i am still unsure how my teacher / school arranges the grades. I often get straight As,but now if i get second honors, i am screwed. I really don't wand to drop to a bad class. My parents don't have a power school account, so i can't see my grades. This is all so disturbing! HELP!!!