You would be in either 9th or 10th grade, since you are supposed to turn 15 sometime during 9th grade (or the summer after it if you have a later summer birthday) and then begin 10th grade at 15 too.
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Well, honey, if you're 15 in America, you're most likely in 9th grade. But hey, don't stress too much about it, just enjoy being a teenager and causing a little bit of trouble along the way.
15 out of 20 would be grade of 75 percent.
15 out of 16 is a 93.75% (A).
13 ÷ 15 = 0.866666.... or 86 2/3 % which rounds to a grade of 87.
80% or B-
66.67% D