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But since they are all internet based, I could not use them for practice while traveling. I also really like mobile apps to throw in some practice questions in between.
Some adaptive software would be awesome, that repeats wrong answers automatically and mainly asks questions in areas that I am not really good in - does something like this exist?

Note that you can download 1,000+ videos through our GMAT Pill HD iPad app:
https://itunes.apple.com/app/gmat-pill-h ... mpt=uo%3D5 You can also check out the
iPhone and
Android apps - though the video experience is not quite as good as it is on the larger screen for iPad. The Android app works on smartphones, not tablets.
So if you are traveling, you can download all the material the night before your travels, and then you can access all of them without internet. You can toggle between offline/online mode in the settings panel.
In terms of your quant - make sure you understand slight variations of the same question. For example, you might get a rates question where two people are walking towards each other - make sure you also know how to do that same question if the two people were walking away from each other--or at 90 degree angles from each other, etc. This is the best way to really understand how things work - by keeping everything the same and modifying one variable to see how it affects the problem.
You can see a portion of what's available for PS Pill students here:
https://www.gmatpill.com/gmat-practice-t ... -questions