Good luck x
As a Year 10, I can guarantee that Year 9 is one of the best years. Just do some homework, listen in class and revise a bit for topic tests - you should be fine. You should be doing the subjects you enjoy and honestly it's one of the last years that you can really have fun, so make sure you spend it well rather than worrying.
Exams and new teachers. Also i want to do gymnastics in high school but i am not sure if i can. Also i wear a headscarf and i dont want to make it fall of my head and everyone laugh. Also I am scared about new subjects.