My teacher once drew a diagram of a box sitting on a TABLE, so the box wasn't at floor level. There's obviously a downward force for the box because of gravity. However, because there's a downward force, there must be an upward force as the box is still. Where is this upward force coming from...
not very significant - you don't want to bomb it because that can drop your average by 1-2 points. If you do well, nothing much'll happen. It's just then you won't lose those 1-2 pts.
The impact it'll have on your grade will be very minimal compared to the other assignments, however, so you...
Definitely Barrons for Math II and World History
If you want a 800 on US History, i would advise reading the AMSCO AP Exam Prep book (a long read.. but that's what it takes for an 800).. AFTER reading AMSCO, read the Kaplan SAT book.
If you simply want a good score (750+), just buy the Kaplan...