After a Methods section which teaches basic techniques, comes a second half that prepares specifically for the TOEFL. One should make both parts carefully, then you are definitely well prepared!
Particularly pleased me that the book is as comprehensive as any actual question is clarified, to strategies that you can score more points by the right preparation over the best words. Does not explain grammar, but you should have already mastered or practice otherwise.
I have come with this book, and 2 weeks preparation time to a value> 100 points (which you can apply in my opinion every university itself, does not require more points).
I can recommend the non but two weeks have been very stressful. The book has over 500 pages, so take your dear four weeks time for it, then remains time allow for repeating and Sacken.
Particularly pleased me that I have learned a lot of things well, I use outside the TOEFLS further can-efficient reading for example.
I Wish You Success! :-)