You will also do coursework which counts towards your SATs. Coursework can be done at home or in class. It is not an exam, you can spend as long as you want on it.
What about my mates?
It is exciting but difficult being 14. Your body changes. You want to spend time hanging out with friends, maybe get a boyfriend or girlfriend.
All this has to be balanced with schoolwork. It is not easy and most people end up arguing with their parents.