I know this was a ways back, but this easiest way to do percents is like this in your head. If you want 22.5% of 31.25 and have to do mental math, take 10% of 31.25 which is 3.125 take that times two and now you have 20% of 31.25 which is 6.25 now take another 10% of 31.25 and divide it by two twice. So 3.125 + 3.125 + ((0.25 x 3.125) or (0.5 x 0.5 x 3.125))
I had a similar problem with the Reach: Beta. I had my national AP exam for Biology coming up 5 days after it was released. I took the exam and got a 3 out of 5. I studied for about 2 or 3 hours. To put that in perspective, I studied for 12+ hours for my midterm and got an 83. The national exam covered every topic in the book, and given the time in the school year, we only got through two thirds of the book. While a 3 out of 5 is passing, it still could have been better. Of course it won't help much that I'm taking 3 AP classes this year.
the AP exams are some of the easiest tests ive ever taken. i went into all of them cold and got either a 4 or 5 on them all
AP's require only 50% correctness to get a 4. 66.7% to get a 5. They are the easiest things imaginable assuming you payed attention for a tiny bit of the class. This is your situation if you don't know already:
I found the school work not too hard but the social part was weird for me because my elementary school had less than 100 people total
Really high-school is not that hard. As the picture a couple posts up says, just don't get intimidated. If you learn to be confident and to try at least somewhat, you'll do fine. And if you're worrying about math (I don't know if you are), don't. Honestly, the paces of even Honors or AP math classes are painfully slow. Learn the stuff, and learn how to apply it, and you will be fine in every part of school. School and tests are less learning the actual material than they are applying common sense and making connections. That's why people who are good at those two things (like me) can breeze through school with little hard work. For people without those skills, you'll have to try to develop them, otherwise you could be in trouble. For High school tests, as said by the great Sir Arthur Conan Doyle, "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth." (BTW, Sherlock Holmes books are actually pretty good. I never would have thought it but I had one as part of my summer homework for AP English.)
None of this even has to do with the reason this thread was created... Not to mention, I'm pretty sure his school year has already started... XD