Hey,
If you haven't already done so, I'd suggest checking out
Manhattan GMAT's OG (Official Guide) Archer. It's an online interface for answering OG problems and measuring your performance. Time yourself on individual questions, mark the problems you guessed on, and note those you’d like to do again later. The tool is free, but if you buy the $14 version, you also get answer explanations to every quant problem in the Official Guide, written by our expert
Manhattan GMAT instructors.
I hope you find this tool helpful!
Best,
Matt Mapplebeck
Student Services Associate
Manhattan GMAT