if the student thinks they deserve a higher grade, they can resit the exams in october/november. nothing can be done about this what-if scenario. teachers should have tried to look at a student's performance holistically when predicting them grades but results day won't please everyone.
it's absolutely normal to be worried, but worrying won't help unfortunately! try to distract yourself with other things ie. meeting up w friends, reading, watching tv or movies. everyone's in the same boat as you and it'll be okay
The results will be standardised so that overall as a country grades are similar to previous years (actually a tiny bit higher). Yes despite this will some individuals get the 'wrong' grades, but I think it is done as fairly as it possibly can be.
Well last year a lot of people did better in their GCSE’s, it was the people who had lower target grades in my school and I had higher target grades which was harder to achieve, I got most of them but some of them were way too high.