What preparations should I do to pursue a chem eng degree?

I am a high schooler, in two years I am graduating and I am looking now to put myself into. I enjoy chem and maths at school, but I feel like I should take some preparations before trying to get a degree in that sort of thing.

I am not a genius, not a top student in my class, but I am capable of studying and I am doing that right now. How clever should I be to pursue this degree?

Maybe I should take some courses in those remaining two years, to understand things better in this, what should I be prepared for?

Ps. My English may be bad, it's my third language and I mostly suck at it, so sorry for this.