There are tons of other free practice tests around there:
- Kaplan (although your score will be really low as compared to the real thing)
- Veritas
- gmatclub
- Knewton

I can't make any solid recommendations for either one, since none is as reliable as GMATprep. Powerprep is slightly on the easy side as compared to current standards, so I'm not sure if you'll get any value out of it. Oh and watch out: if you're running Vista (especially 64-bit, like I am), it'll be a pain in the behind getting that thing to work.

I would say go over the mistakes and retake GPrep. No use retaking MGMAT Prep even once as all questions will be repeated from the 6 tests you would have already taken.

Even I was getting repeats in GPrep both 1 and 2 after my 3rd retake of each. Ised to knock off 750 regularly in those tests. Hence I thought of giving the Q and V sections seperately as sectional tests. My actual GMAT is on monday. I decided to re-install GPrep and found that the Gprep2 is the hardest GPrep test i have taken with only 3 repeats in Q and 3 in V. The quant especially the inequalities was very tough.


But hey, thats good enough. Prepare for the worst :)

I took the Kaplan paper test, which is avaiable in the Kaplan Premier.

I got 32/37 correct in the quants and a terrible 19/41 in the verbal.

How good is the quants score.
My test date is in Sep

The number of questions you got wrong doesn't really matter that much. You can get 50 in quant (which is 94 percentile, i.e. you did better than 94% of test-takers). There are other factors to be taken into account: difficulty of questions, distribution of mistakes... No one can really estimate your score unless you take an adaptive test.