Is the Mometrix ATI TEAS secrets book enough to study with? I heard many people say they used the book, and some apps, and some additional books, and this and that, it just overwhelmed me. I just have that Mometrix book and one additional math book (I think math will be my weakest subject so thats why) But I just kind of want to focus on those two books and that's it I don't want to be overwhelmed with all types of different additional materials. Do you think these 2 books is enough or should I use all the other things like people say?