Here is a major issue with the IR questions on the GMATPrep (and the extra ones provided along with OG13):
They are way tougher than what you will encounter on the real test.I have taken the test myself to testify this fact.
Hopefully it gets fixed in the upcoming software update next month.
Can't agree or deny that. But that is a moot point anyways.
If you are doing a 'What-if' analysis on IR section, you will know the answers after 1 shot at it. So, the difficulty level doesn't matter at all and therefore, it is a bit weird that you can't get a 6 on the Gmat prep.