princeton review/sparknotes for physics..

<p>ok, so i took the princeton review test in physics and got 750, because i was too slow, and half of the question i could have done i didn't get to them :/ then i did sparknotes test and done it in 45mins and got 800 with only leaving 3 blank (cause there were missing pictures/wrong simbols in the test) and 5 wrong (some, again because of them messing up with simbols :/)... anyways, i was wondering, how good are this tests?
I find sparknotes test very easy and do them quick, and princeton are not hard, but, need more time.. how do they compare to real test?</p>