Hi,
The quality of questions are comparable to the real test. But the
expert's global mocks aren't computer adaptive and you experience random jumps in difficulty level.
I got a V40 on my first attempt of the GMAT but I wanted to improve my quant. I decided to retake the test and started preparing a couple of months ago, studying 4-5 hours every day. I took an official mock and got a Q50V44. But I scored a Q47V35 on my
expert's global mock yesterday. My quant has always been in 47-51 range, so no surprises there. But I was taken aback by the verbal score. Again, I don't think there's anything wrong with the questions, I just think the scoring algorithm doesn't mirror what happens on the real test.