for GC, you don't need as much time you did for topscore or the achiever (IF you did any of those). i think i only had maybe 1-2 questions that I actually had to calculate. Most of the answers are in the format of the equation. i.e., (50)(40)/(0.0821)(2). something like that 🙂 for QR, all I can say is to try to get through MATH destroyer in 45 minutes. that helped me the most. although I had like 2-3 questions that I had to guess.