That is 50%. Depending on your teacher's grading scale, it likely an E, perhaps a D.
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If you got 20 problems wrong on a 75 question test your grade would be 73% or a C. You can find that by subtracting the amount of questions you got wrong from the amount you got right, 55 in this case. Divide the amount of correct questions by the amount of questions on the test to get .733333. That is the grade.
If you're looking for your grade... You got 45 questions out of 60 correct. 45/60 = .75 or 75%
An examination paper with 10 questions consisting of 6 questions in Algebra is one paper that needs proper preparations.
4U means its a grade 12 course, and it is University Preparation. 4M means it is a grade 12 course, and it is University/College Preparation.
Missing two questions = getting eight questions correct. 8/10 = 80%