Acrylic is easier to learn with because it solidifies faster. If you're the type who blends (you'll know one day. one day. *sun rises*) then it will force you to work fast, which is a good thing in some ways. Also, messes are a little less can-kill-you-and-pets, the work is easier to store as it dries within a few days instead of after you are long dead, and you can work on just canvas paper or the wall of a building and it won't matter with acrylic. Acrylic is the shit. (So is oil, but for lots of different reasons. Just... just trust I'm giving you good advice, alright?)
Anyhow. Who is teaching the class?
Not that especially matters. Just show up every day, and at least a few hours every weekend, and paint, and then show it when it comes time to do so. Complete the assignments as best as you can, or at least give it a wild shot in the ballpark if you get stumped. You'll pass. Spend your worry instead on things like, hm, well, did you know that you carry all kinds of horrible acids and other totally nasty chemicals with you every where you go, right there in your body? Isn't that just alienating? Doesn't it make you want to just tear off the itchy, creepy skin of life? No? Yeah, me either. See? Everything's more or less alright.