I'm taking Organic Chemistry this year; however, I took Physical Chemistry my freshman year. You seem like a smart fellow, and, if you can pick up calculus I & II, it might be advantageous to study P. Chem as well. It gave me some clarity that many students didn't have on the first few homework assignments in Organic. It's really just learning the math and physical relations that play a role in chemistry as a whole. It's a very neat course.