
Qingqing Y. answered 06/30/20
Education Ph.D.; 169 Quantitative, 165 Verbal, 5.5 Writing
Regarding math, I feel the most efficient way to prepare for it is with OG, official mock tests & the 5 lb book of practice questions. The key here is not so much about theory but about practice & the practice should be directly related to GRE, which includes a very small subset of all the math problems in the books you mentioned.
It is most important to 1) go through a large number of directly GRE-relevant problems to 2) reveal your underlying misunderstandings and 3) correct them.