AP Priorities

<p>Hi, I'm going to be majoring in Engineering (I'm not sure which branch yet) and I have three AP tests this week. I need a 4 in Physics C Mechanics, a 5 in Physics C E+M, and a 4 in American History to get credit for college. Should I focus heavily on studying and doing well on the American History exam over the others since I won't be dealing with history so much as an engineering student, or should I balance my time studying for the tests equally?
Thanks!</p>