I take it you're asking me since I was the last poster?
Yeah, was 20, I think, which is a bit of a bias since I'm older than I should've been. American tests are speed tests.. which is ridiculous in the sense that they expect you to do as much as possible, without much thinking. I'm dyslexic, so I really hated the fact that they expected me to speed read and speed think throughout the whole exam.
The trick is simple.. for the SAT, the easiest questions are first, and the hardest questions are later. All are equal.. and an educated guess overcomes the guessing penalty. If you lose 0.3 marks for a wrong answer, but get 1 mark for a right one.. if you could rule out only one answer, you'd gain points for guessing. Most kids are too scared of losing points to guess.. and the SAT is all about getting higher points than everyone else, even though I probably got high marks for scoring like 60 out of 75 or so.
Simple example:
You have X apples. Using some long method that takes 5 minutes, find out how many apples Bob has.
A. 22 apples
B. 32 apples
C. 44 apples
D. 21 applesYou can score in similar questions by ruling out some answers in 20 seconds. If you can just find the last digit, you can determine that it's A/B, C, or D. That way, you have plenty of time to figure out the right answers for other questions