Without a shadow of a doubt, the worst thing for me was that I kept it bottled up until literally the day before school. You think, at the time you just need to get on with it because it always happens and you don't really know any different. But if you just talk to someone, it will help. It's very likely that your school has a support centre kind of thing. And if you just tell your mum or dad they can talk to the school about it on the first day, maybe even before, if your school has a non-pupil day before term starts. Which is exactly what I did 2 years ago when I was going into year 11.
When I was about to start back in year 11, I'd just received my Physics GCSE result which was below my target grade and I was worried that I'd get in trouble for not getting the result the teachers said I should've got. I realise now, that the grade I got was still good but when you see that target grade on a piece of paper and then your actual grade next to it, it seems like a huge deal.
If you're worrying about forgetting something you need for school, make a list. I don't know about you but making a list in a super nice notebook is quite satisfying. And even once you've made your list if you're still in doubt ask someone else if they they can see anything you've forgotten. And I've found that I remember everything thats actually really important (pencil case, bag, folder...).
I hope that those couple of tips I shared will help a bit. If anyone wants to ask me a question about going back to school feel free to leave a comment and I will try my best to get back to you.
Thanks for reading,