2 wrong out of 13 means 11 right out of 13
11/13 = 84.6%
This typically translates to a solid B on many, if not most, grading scales.
At Hogwarts it would probably be an A (Acceptable) - or possibly E (Exceeds Expectations)
YMMV
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If by grade you mean percentage, you would have scored 67.5%. 40-13= 27 (27/40) * 100
Well, honey, if you got 4 wrong out of 17 questions, you'd have 13 correct. So, you take your correct answers, divide by the total questions, multiply by 100, and voila, you've got yourself a grade. Math doesn't lie, darling.
13 wrong out of 85 is 72 correct. So percentage score = 100*72/85 = 84.7%
If u get 1-5 wrong A 5-10 wrong B 10-15 wrong C 15-20 wrong D 20 and up u get a F
12/13 correct is a 92% which is an A-