Hi there! GCSE and A level PE student here. In my experience (with OCR exam board), we had to do 3 sports, those that didn't do 3 sports outside school took less popular sports like table tennis and handball since it's easier to get high marks in these since few people take them and a lot of people doing, for example, football are likely to play to a high level since they are able to access better coaching and facilities etc locally compared to someone playing handball. So it's likely you'll have to pick another 2 sports, but hopefully your school can help you choose ones you can get good marks in. Another thing is the course was heavily theory-based, the practical only made up 30% of the final grade, which suited me as I'm quite academic, if you like sciences/ are interested in sports science then you will probably enjoy it. We also did next to no practical work at school, and were expected to collect evidence outside of school. Long story short, other people may be better at sport than you, but considering practical ability is not the be-all-and-end-all of GCSE PE, you probably won't be at a huge disadvantage. It's worth speaking to your teacher about the specific exam board (I think AQA is quite similar to OCR but I can't speak for other boards) to see how many sports you need and what weighting there is on practical.