Homework explanation

My teacher gave us 7 pages of homework for my grade 12 bio class. It's taken me two hours to do 5 pages and I'm still not done. I literally do not understand the concepts for it and it's 1:30 am now and I'm flipping out. Any suggestions? I don't want...

my teacher to think I'm a slacker and give me a bad mark

Just try and go talk to him before class and explain to him - I'm sure he'd rather that then wait till class comes and you go Sorry, I didn't finish because I'm sure he'd be like Then why didn't you come talk to me before class?. You going and talk to him shows that you are making an effort.

Try to B.S. the last two of your pages, and talk to him in the morning so at least they'll see you put an effort in.