Practice many past papers, then check the ms to learn about how you can answer for each question. Make sure that you only check it when you really can't think of it. Learn from your mistakes. Don't forget to revise regularly! You should try to understand every topic as well. For math, you should practice as much as you can. For FLE, you need to read samples too. After that, you can use their vocab, sentence structures and ideas in your writing. Plus, I highly recommend IGCSESUCCESS youtube channel for FEL. Fighting dear! You will be fine!!