I have not given GMAT, but I have lot of friends who have, If you solved the questions from the recentmost edition of OG, I am not sure about the standard of the questions. As far as the edition before OG10
, recent most one, while solving problems in OG without error is good, the current GMAT maths has left OG far behind. The problems in OG are ridiculously simple, and they would fall under the category of easy maths,,for instance there is no probability at all in OG, which is the typical difficult maths.
I dont mean to upset you but, dont get smug with the way you do OG maths at all, they are just warm ups.
Fear Mediocrity, Respect Ignorance