BTW I should mention that poker books are so last decade...
For what you'd pay for a couple of half-way decent poker books -- that may or may not be entirely relevant in terms of modern poker strategy
-- you could pay for like 3 months at a training site like DragTheBar where you'd have access to a wide array of coaching videos covering all aspects of poker, including math, while also allowing you to ask questions directly of the coaches themselves. Many people grasp concepts a lot faster from a visual presentation like a video than they do from reading a book. That said, some of the aforementioned book authors (like Owen Gaines, a coach at DTB who also produces videos there), will also take questions on anything in their books.
If it sounds like I'm shilling for DTB, yeah I kinda am, but there are a number of other popular training sites as well -- Deuces Cracked, CardRunners, BlueFire, LeggoPoker (recently purchased by Phil Ivey), etc.