I have read online that the real GMAT contains some of the EXACT questions as OG (who needs scoretop when you have OG?).
I have just taken GMATprep (first test 3 times) and I have noticed that every test contained 1-4 questions from the OG or the Official Review. Although these make up small portion questions, it does make a difference in your score.
Can I expect the same in the real GMAT?
Thanks