An 80% is pretty good, but you can do better! I know you didn't ask for advice on how to do better next time, but here it is anyway

Read a little bit everyday, write your own notes from the book and do the end of the chapter questions. Then when you're in class you can ask questions about things that you don't understand or need clarification with. I wouldn't be mad at the teacher. You say you're "only" a sophomore in HS, but you are old enough to take credit for your own learning. Don't depend on the teacher as much and do some regular out of class learning. It's an honors class, so generally it should take more effort than the other classes. It's a great thing to start too so if you go on to college you'll have had some practice. If you do a little bit everyday I'm sure you'll see an improvement on your grades. Soon you'll see that two hours the night before a test is nothing and just won't cut it once you're out of high school. I'd start some healthy study habits now so down the road it's not as much as a shock.