Reading your post, it seems youve used the following:
2 from GMATPrep (download from MBA.com)
6 from
MGMAT (browser-based)
4 from Kaplan (on their CD)
-Im not familiar with the PR materials, but I think they have 1 free CAT online.
Here are a few that you may not have encountered:
Crack the GMAT, one free to download:
https://www.crack-gmat.com/gmat.htm800score.com has 5 CATs for $24.95, pretty cheap:
https://800score.com/5testorder.htmlHope that helps. Cant say how indicative all of the referenced CATs are, but as always, GMATPrep seems to be the universal answer for score accuracy. You could always try and re-install that as others have done. I believe theres a post stickied somewhere on how to do so.