Take it from someone who had your approach (grind out practice questions/CATS and learn from the mistakes). My CAT results stagnated right below the 600 mark. I found myself encountering questions where I literally had no idea what was going on. In fact, on my most recent CAT, I scored Q40 with
22 incorrect answers.
I could've spent that time more productively by sticking to learning the fundamentals. Beneath the smoke-and-mirrors of tricks the GMAT throws at you, are questions that simply test your comprehension of the logic behind basic math/verbal concepts.
I'm just over two weeks out from my test. I highly recommend you re-think your study strategy and don't waste valuable time, as I did.