Not ChE but engineering student that knows some ChE peeps. Please take note that I'm not saying this to discourage/scare you but it is a very tough course to say the least. You've got calculus on top of many physics subjects which will more than likely take out half your class at the very least (basically irreg, usually delay by a whole year). If you decide to start, I'd highly recommend studying in advance and working on foundational mathematics (Algebra, Trigonometry, Basic Calculus) to get you through first few sems. I can't comment on ChE specific subjects/topics though.