How Useful Are These Books?

Hello, I just ordered the books 2400 in 7 Steps by Shaan Patel and Effective SAT Strategies (the “Black Book”) online. I read part of 2400 in 7 Steps and it seemed good and went through the steps and the questions mimicked the Collegeboard (his website says he uses actual SAT questions or 99 percentile scorers on SAT to make the questions) and I’ve heard that the Black Book is the other essential along with the Blue Book but haven’t actually looked at the book. Has anyone used these books, because I’m wondering just how helpful they are? Taking the SAT in November…

Barrett’s book is good, but I’d also get a copy of Erica Meltzer’s book.

Thanks Marvin100, yeah I was considering getting her books if I still need help with SAT after thsee books.