Don't worry the mistake most people including myself did was to work more on content than past papers. I think it's better to finish revising the content as soon as possible like 1-2 weeks, then don't past papers and seeing what grade you get, hating that grade until you keep getting 9s, not getting overconfident, fixing mistakes and revising topics that you are weeks in or those that are genuinely hard, stay humble, learn from everyone, and from yours and everyone's mistakes. See more GCSE advising videos, forget how far you class has gone in terms of content, just finish it your self before ending year 10, now I am no one to advise and I don't have the grades to boast about and grades that make me worth listening to. I have always been a loser myself. But there's a lot of content and advisories in YouTube and most of them got grade 8 and 9 so pretty trustworthy, and if they are boasting in their videos ignore that video since there is plenty of fish in the pond. Good luck pray to God, don't do any bs in school or in like, if you can't say it with pride then don't do it. Like the kids in Mayfield break doors and stuff and have the most bs students in terms of causing havoc. Respect everyone. Remember the nerds get the good grades but tale plenty of rest too, and leave all the unnecessary stuff for post GCSEs, and stay absent to revise when GCSEs are close, since your attendance doesn't defy your grade and your school would care the very least when you get bad grades.