53 percent is considered a failing grade.
3rd grade
53
23/30 = .7666 = 76.66% = C
A or 80 %
80
67% or D+
That would be 85% (30 divided by 35) which is normally a grade of B. If you only missed 3, you would have an A-.
Your grade would be 64% if you get 16 out of 25 answers correct.
23/30 = .7666 = 76.66% = C
A or 80 %
70% is usually a C-
80
you would have a 94
You score 90%. Your grade will depend on the grade boundaries determined by the testing organisation and any other normalisation.
Sine she is in (American) 10th grade (Japanese High School 1st grade), she would be...15 or 16.
23
The 10th grade - 15/16 years of age
If that's 29 out of 30, that's 97%
67% or D+