Yes, some of our math questions are too computation-intensive. Not all, but some. If you hit one that seems a little too ridiculous, don't worry about it.

Having said that - the math on the official test can get very difficult (though not quite in the same way - there's still usually a key to solving within 2 min, but it's a lot harder to find it). Be prepared - you will hit stuff on the official test that you cannot do in 2 minutes, no matter how good you get. If you're unprepared for that, you will spend too much time and get into trouble later in the section.

Also, on the official test (and the GMATPrep software), you will have experimental questions. Because experimental questions can fall at any difficulty level, if you are a very high level math person, you will get some "brain break" experimental questions - questions that are easier for you. Our tests (and prep tests in general, with the exception of GMATPrep) don't give you these brain breaks because we don't use experimental questions (though we're working on building that functionality into our tests as well).

So that's good - but if you're a high level math tester (and TkNeo, you are, if you scored a 48 on our quant section), be prepared - you will have questions you can't do. Most people have to guess on 5-7 questions (educated guesses - not random!) When I take the test (99th percentile), I usually guess on 2-3 questions - so it really doesn't matter how good you get. You're going to be making some guesses along the way (or you're going to run out of time... in which case, you'll still be making guesses...)