i did year 7 in england and I don't believe accelerating was an option, but I was always rlly good at maths and stuff and I reckon if I knew about accelerating, I would have done it and I wouldn't have ended up in standard maths. that being said one of the reasons I always did bad in my exams up until this point was because of undiagnosed adhd and some other problems so although I was good at the classwork, I was never good at exams and almost always got like a 60 in all my math exams bc I was never able to finish bc I ran out of time. so I reckon if I was diagnosed as a kid and then had my issues resolved like they are now I would have absolutely slayed accelerate maths
(basically I'm delusional)