Goodness, you've got plenty of time. For me at least, English was a lot of self-study and memorising. Definitely pay attention in class and make notes. Then, you've practically done all the hard work. If you have the money, then do get the CGP ones, there was another brand called York.. or something. I would say get the ones your school sells. You don't have to be too special so learn what it says, stick to it and try to come up with a little more developing.
PMT (physics and maths tutor- despite its name it has other subjects, including English, so just pick your exam board (free btw))is also a good website.
Also don't forget about English Language, I would even say prioritise it later on. Try to get into reading more if you aren't already. (Or at least the books you're told to read in class.)
I don't really know how to summarise two years worth of English but this is mainly what I remember. Happy to answer any other questions though!