For circular functions ( not so much area sorts of things), but things like sin, cosine,
all it takes to get good at this topic, or at least go from struggling to understand, to understanding it, is not memorising formulas; but learning the concepts behind it all, how the unit circle works, etc. I used to suck at it but then an old tutor of mine explained how it all worked and in 15 minutes suddenly everything made sense.
id say just sit down with your teacher at lunch or after school and try to get them to explain the conceptuality of things. better yet - if there is a specific thing you dont understand why you do it, flat out say "why? show me a proof please" and odds are it will make sense. and if they cant explain it in a way that clarifies, have a session with a tutor or something?
just my experience

good luck