you can relate gmat questions with the ones in CAT (in India). You know--in most of the cases--how to solve these, but the time constraint plays a trick. It's not difficult to crack the exam, the only thing that matters is the time-management.
I believe, 99% of the people, here on this forum, will be able to solve all the 37 question if you remove the time constraint....how many gets it that a different story....
don't underestimate....keep improving. gmat tests your ability to work under 1000s of assumptions and pressures.
just go for it