Started A levels three weeks ago!!!

Maybe revision at school during my free periods, not at home.

So, simply, you revised a lot throughout the year.

No, you're just very talented and part of a minority of people who got those kind of grades in 1 month.

No, this is a bit ridiculous. Honestly! Heck, I've got my uni exams in about as much time as the OP has their AS ones, and I haven't even started my course yet. Most people haven't, yet some people are already starting to revise?! C'mon.

so I put in zero effort into my IGCSE's, I slobbed around, didn't do any revision and spent half the exam doodling silly things onto spare paper and annoying invigilators.

I was fairly surprised at receiving 7 A*'s and an A (in economics, somebody isn't going to be happy about that) and was ecstatic at being the only one to have scored an A* in Additional Maths in my school's history.

That line gets blury when you do Maths + FM so most of your timetable is filled with maths lessons, to be fair.

But even then, for someone doing a single subject, this is too early for revision. Any small revision for tests and mocks is sufficient enough, and a good start at around Easter time is fine.