Question about Science (Grade 10)

I’m in grade 10 and got a 65 in science. I’m not particularly dumb but in this class, I didn’t really pay attention, do the homework, and my teacher hated me and was really bad. I definitely could’ve done better if i tried/did the work.

I’m nervous for next year because i’m taking all 3 sciences in grade 11 and I want to get my average to around a 90.

Any advice on what I should do? Should i take science again in the summer so i’m ready?