If you have finised OG-10 and OG-11 and looking for more challenging questions then I will suggest you spare some 20 bucks and buy Manhattan SC
guide (it is worth even if you have that book already). With that book you will get 6 CAT online which are very good tests and close indicator of your performances next to GMATprep. And for math go for GMAT club challenges
. They are worth taking especially if you want to increase your quant score from 44-46 range to 48-49 level.
Nobody dies a virgin, life screws us all.