We used both the CB book and the Khan on line but after doing both, I would not waste money on the book. I do agree you should print out practice tests and do timed, written practice test but for the exercises on line was fine for us.
We used both the CB book and the Khan on line but after doing both, I would not waste money on the book. I do agree you should print out practice tests and do timed, written practice test but for the exercises on line was fine for us.