I wouldn't worry too much about the math portion of G-chem. It's mainly approximations (log and etc), and setting up an equation that's comparable to one of the answers (not all of the answer choices are numerical answers - ie. for Pv=nRT, you'll have to answer for pressure, and it will be in the form nRT/V).
For QR, there are better people out there to answer this question than me. I'm slower in math, and I just had to practice over and over again for speed.