Cracking the SAT by TPR, Do you think this is a good book?

<p>When I practiced with College Board’s book during the summer, I got about 630 from critical reading section at the end of summer vacation.
But, I did started practice again with cracking the SAT…
AND I got 530-560…the score is lower than I got before the summer
is it general to get lower score with that book? or did i become an idiot?</p>

<p>this is not the one 11 practice tests… its the cracking one…
i feel so bad:(</p>