I took my GMATPREP and got a 730 M-48 V-42
You do not know how ecstatic I was to receive that score. I have been on and off for well over a year and just within the last month I was like, ok time to schedule, lets focus. My last practice test I scored a 690 back in the fall and thought I hit a roadblock, and when I first started even looking at the gmat way back even before I started to study a few years ago I scored around the 550 range.
I have a little under 2 months until test day, and this score was definitely a boost of confidence. I need to focus hard and keep going.
Challenges are definitely helpful as this was my highest quant score ever. The challenges give you confidence in attacking any question the GMAT can throw at you and is probably the best deal out there in the world of GMAT preperation.