What's the best textbook for SAT? SAT II?

I just took my first test of the SAT on Princeton Review and got a 1800. I haven't taken a PSAT/SAT before so I'm not sure how accurate this score is. My friend told me Princeton isn't that accurate and it would be better for me to take the Collegeboard one or Barrons because it's harder. Which should I use? And for the APUSH too, I was thinking of getting Barrons for the SAT II.