I have taken 3 MGMAT CATS.
3rd 640: this is the most accurate. On the 2nd I got really lucky on the quant b/c I guessed 5 700-800 problems correctly w/ no POE.
However, the verbal was plauged with ridiculously long passages that MGMAT has confirmed to be its own mistake. (112 lines on one passage! Not even going to mention how difficult the material was).
Anyway, I have 3 more MGMAT tests left. 2 GMATPrep tests
I plan to take my 1st GMAT prep next Thurs or Friday.
Any other tests I should gather and how often should I take tests? I heard Kaplan