'some natural affinity' lol
I reckon a combination of most of these:
- work so hard that it would blow your eyeballs out
- intense all-round inborn talent and intuition
- tutoring or at least very strict homework patterns enforced by parents whole life through
- absolute fascination with learning / general round-eyed-wonder from age of about 3 days old (the sort that's doing squares and cube roots of car numberplates *just for fun* at age 2)
- excellent knowledge of how they learn and how best to study and plan
- decent amount of sleep
- very early learning of course content
Maybe I'm exaggerating. But I do believe that the difference between say a 98 and a 99.95 is like... huge. There's no just 'yeah pretty good at the subject' or 'did lots of work' - 99.95 is hard core stuff, unless you're an absolute genius (which unfortunately most of us are not).
Though I suppose you just do what you have to do to get a 50, and repeat in all subjects, including a couple of scale-above-50 ones. Sounds easy, right?
(sorry, as someone so-many-miles-away-from-99.95-that-it's-not-even-funny I'm really not being helpful here)