1.5 months before the June exam, I started out with a 560v, 790q with Power-prep. Did some practice with Big Book, princeton review, kaplan, and GRE bible. Half of the time was spent roting vocab from a combined list (1.5k semi-familiar to unknown words) from the aforementioned sources, and the other spent taking practice exams. On the June exam, I took a 690v, 790q.
Can't say much for the quants but regarding the verbal.
The last GRE power-prep gave me a 700v (pretty spot on)
Kaplan was unforgiving (650-730 near the end)
Princeton review was a bit inflated (700-750ish)
Big book (A lot of practice exams, 20+. Did 1/2 of them without the reading comp, the other half completely) fluxed from 690-800 depending on how the reading comp faired.
GRE Bible started with 500ish but eventually got consistent 800s (reading comp questions were too easy and the scoring system wasn't refined)