What grade is 55 out of 63 correct?

To find the grade, divide the number correct by the total number of questions and multiply by 100 to express it as a percentage:

(55 / 63) * 100% ≈ 87.3%

So a score of 55 out of 63 is approximately 87.3%. This would generally be considered a high B or a low A depending on the grading scale used.