you can have luck in the sense that all you topics you revised came up and all of the ones u were unconfident with didn't come up. but you can increase ur luck by revising everything properly
Some smart ones aren't lucky though, one day in the exam room changes your life. Anything can happen, they can still fail.
Luck has an element, but thats why you don't sit just one paper, i don't know what its like now but when i did maths a level there were 6 exams (the same for further maths) and all the sciences required 4 exams + 2 empa's.
It's about averaging, over the course of 2 years the students whose combined work ethic + ability tend to equal the best marks, it's very rarely fluke. The luck element is very low when looking at final qualification grades.
Absolutely this. It's down to hard work. If you're someone like myself, who has extra time due to poor memory, it's even harder. But I have good exam technique and persuasive writing skills which are hugely beneficial in regards to the success in my subjects. Just memorising dates and stats is difficult.
If I can do decent, anyone can. Just gotta put the effort in, for some it's more than others.
Given how structured exams are, there is really little to no luck in my opinion. I could do 5 past papers and my scores will almost certainly be within 10% of each other. The largest source of "luck" is probably health - no matter how much you've prepared, if you get something serious you might not be able to sit your exams at all.
There might be a small amount of other luck, but if you're sufficiently well-prepared and have no weak spots you should hardly be affected by it as if you find it hard, everyone will probably find it hard and the boundaries will reflect that.