What revision/study tips or hacks helped you in your Maths/FM A-Level?

All I know rn is practice papers which is the most obvious, but if anyone's got anything else they think is helpful please share!

Yeah, try going through the textbook reading it properly, and trying to understand why something is etc. e.g. in 3D vectors, the r.n=d the unit vector of d is the distance from origin. The n means anything perpendicular, so when it comes to reflection questions this will help a good amount.
Also watch exam solutions, hes pretty cool. And if you want to get better at problem solving, start tackling MAT papers and UKMT papers for fun.
Good luck!