Wow, have you studied chapter 3 already? I didn't know that some school are having sac 2 after the first sac that quick..
Ohh yeah do you have a tutor?
The way I study Bio is read a few pages ahead before the teacher teaches the topics so I know what's on top of my head, and while the teacher talks(my teacher talks damn a lot which bored me easily), I just down some notes quickly and rewrite it during recess..At home, I just summarise the Nelson book, NoB, Biozone, A+ together so my summaries contain more than what the textbook tells and read the textbook a few more times over the following week, and do the NoB quick check questions and some useful review questions because I found it to be really useful. If I think that myself is alright to do some questions, then I will do the ones from checkpoints, A+ and possibly some chapter test exam paper... after this you will find that you have consolidate your knowledge and you wont forget it easily! and remember that you always have to read through the key terms/definitions again and again...I always memorize them because I can't really understand them.. BUT MAKE SURE UNDERSTAND YOUR WORK AND WHAT YOU'RE DOING.