A CAT is giving you questions clustered around your ability level. The OG has questions at all difficulty levels (the lower numbers are generally easier), so you can't really make an easy comparison in terms of anticipating your CAT performance based on your OG performance. (Also, mental fatigue is a factor - exams are typically longer than your usual OG problem sets.)
However, I'm hoping in the future to be able to answer these questions instead of simply playing the time game.
I want to address this. I agree that you're trying to improve, which means learning to answer higher-level questions correctly. But you also know that you'll never be able to get everything right... right? As you improve, the test will just throw a harder mix of questions at you, so you'll *always* have a number of too-hard-for-you questions.
The question to ask yourself at this stage (for these too-long-and-wrong Qs) is: which of these do I think I can learn to do in 2 minutes
right now. These will be ones where you already know the material and maybe even the solution method, but your feeling is more one of "Oh, why didn't I think of that?" or "Oh, that's what they were asking?" after you read the explanation. You get it. It just didn't occur to you in the moment to think of it that way.
So you learn what that solution method or line of reasoning was and then you also figure out what the clues were in the problem that should have triggered you to think of this particular solution method.
For the others, you say, "Yeah, I should've let that one go. When? How should I have guessed?" Don't neglect to study when and why you should have known that it was too hard - you have to get used to making accurate assessments of problems so that you don't go too far in the other direction and guess too quickly.
Have you read this yet?
http://www.manhattangmat.com/blog/index ... anagement/And finally I just have to quibble with the words "timing game." :) The "game" is when people spend way too long on some problems and then have to rush on others to make up the time. The best way to take the test is NOT to play that game, but to allocate *roughly* even time to each question. (Which, on quant, means most questions in the 1.5 to 2.5 min time range. Note that I'm not saying everything has to be right around 2m.)