It's entirely possbile to obtain an A in P.Chem. I found taking higher division physics and math classes (Q.Mech, Therm, Diff. EQ, etc) to be extremely helpful.
People often talk about how difficult organic, pchem, and even quant are, and I never quite understood their complaints. Believe me, I'm no genius, but it always seemed to me that the difficulty was not so much in the material itself, but rather, in learning how to study for these courses. Unlike other subjects, you cannot cram even the week before the exam and expect to do well (A-level material). Studying Pchem, like studying organic, has got to be a daily task so that you understand the reasoning behind the math or the synthesis or whatever the case may be. If you've got that, you're golden because you can roll up your sleeves, apply some logic, and pretty darn well work your way through any test problem you'll see.