So I thought that the GRE big book was the same as the ETS purple quant book. Went out and bought that, but then I saw that the pages were not lining up and questions were different. Why did Greg do question/explanation videos for the Big Book rather than the official ETS purple quant book? Also, where can the Big Book be found? Because the one I see online from 2002 is A: Old and B: the pages and questions still don’t align with the study guide.
Greg uses Big Book as its officially discontinued by ETS while the official OG (purple) is still in print and can be subjected to copyright.
the Internet
So I’ll just stick to the purple one.
Yeah, use that as your main book and for further practice you can use Big Book.