<p>Are they as difficult as seem to be? Physics apparently requires you to memorize all the formulas and theories, and to do 75 questions in 60 minutes without the aid of a calculator. US History has 90 questions in 60 minutes, and a much harsher curve than the AP exam. It seems that it will be quite difficult to score very well on these exams… I have the Kaplan book for US, and the Sparknotes book for Physics. Anyone know anything about those books in comparison to the actual test? Thanks for the help.</p>