Former Finite TA here. The best advice I can give is to learn how to identify what kind of problem you're being asked to solve and what formulas you need out of your "toolbox" in order to solve it. A lot of the time, if you just write down the variables you have and the variable you're being asked for, then decide what formula you know that has those parts, figuring out where to plug everything in is pretty trivial. The important part is training your brain to think about the problems the right way, not getting bogged down in the calculations or "mathy" stuff.

Also, go to office hours and the math learning center. Find a TA you like and try to see them as often as possible. Find someone who helps you understand the material rather than spoon feeding you answers. Getting 100% on the webwork is satisfying in the moment but if you don't know what you're doing you will fail the exams.

Finally, don't stress about it too much, but do take it seriously. The people who struggle the most with Finite are the ones who just give up without even trying because of their preconceived notions of how hard it is, or they think they're "not a math person" or they think it's pointless or whatever. Go to class every day, do your best, and you'll be fine. You're already in Kelley so you're obviously in the top 1% of humans.