General GMAT Questions and Strategies | Re: Are question packs from GMAC more representative than OG?

Are question packs from GMAC more representative than both OG and OG supplement guides? I have 1 month before the exam, (although I plan on 1 retake), but I am only through the OG. Does it make sense to move to Question Packs, instead of the supplementary guides? I am weak in quant, so it takes a long time to go through/review every question. Thanks.