I did Cambridge IGCSE English a few years ago, not sure the exact course name! The exam was very much based on your writing skills. You get given some text and have to answer questions on it and write based on prompts they have given you. I would say do as many past papers as you can, get an understanding for the feel of the paper! If you don’t have the text book for the exam content I’d recommend getting it. That combined with past papers I found was all I needed study wise 😊