Based on the Score Estimater on this site, I saw that the 800 score tests are supposed to be close to the real tests. So I bought 5 tests from 800 score . com. Till now I had been scoring very well in other tests such as Kaplan
(670), Princeton (720), GMATPrep (770). But I found out that I was scoring only 660 around in tests from 800 score . com. The questions in Math are simply too tough given the time constraints. This is my last week. Someone had posted that 800score are a bit easier. I think that person was probably referring to the free ones and not the paid ones. DO NOT BUY 800 SCORE . COM TESTS!!!