Difficulty of Official Study Guide Physics and Math 2 Tests?

To those who have taken the Subject Tests for Physics and Math 2, how does the difficulty level of the Official Study Guide’s test compare to that of the real thing? I’m asking because I have the Princeton Review for both Physics and Math 2, and while I scored 800 on the Official Study Guide tests, I only scored 700 on the Princeton Review tests, so I am a bit worried about my performance come test day.

The Official ones should be the same as the real thing. Most of the study guides are harder than the real thing. Princeton Review tends to be pretty close to the level of the real test in most subjects.