The tests i found here were of the same format of the ones seen in the exams and adapted in the same way to the official ones (level of difficulty, content, etc.). However, with experience, I found that the test results (i.e. grade) differed to the official ones even if the ordering, difficulty and content of the errors was very similar. I find this differences quite relevant when speaking about something as serious as the GMAT score, even if the experience is as close to reality as it gets. I also found that quant questions lacked difficulty when constantly getting the answers right. Having said this, i find it on average cheaper than other GMAT exam providers plus the experience is better than with others, i hope other users enjoy it as much as i did.