^There is a long running thread about recommendations and discussions on books. It is not void of bad recommendations but it represents a better consensus than the individual threads. As far as the math goes, there are a number for regular contributors that have helped students here and have published books. One can weigh the advice given here and ascertain the quality. The author of PWNSAT used to be active here as well and his book is a lot more helpful than the ones that are advocating a more “difficult” scope.
For the verbal sections, there a couple of perennial favorites such as Erika’s and Mike Barrett’s books. Verbal is more subjective than math as people come to the test with vastly different levels of education and reading ability. Math is more universal element and probably easier for most to improve on.