I have always advised others to give gmatprep on time, but I myself havn't given one because of fear for verbal.
But you should at least give one gmatprep now, as ideally by reinstalling we can get 4 tests with fewer overlaps.
I m also planning to give soon...lets see...I have dropped my plan for powerprep.
Only Gmatprep and
mgmat Cat's.
I have one concern regarding the pool banks for two tests. If someone can confirm whether they have different or same pools, it will be very helpful to plan further.