(Points earned / Total possible points) * 100% = Percentage
(95 / 125) * 100% = 76%
Then, you need to know the grading scale used by your teacher or institution. A typical scale is:
* A: 90-100%
* B: 80-89%
* C: 70-79%
* D: 60-69%
* F: Below 60%
Based on a typical scale, a 76% would be a C. However, your teacher might use a different grading scale, so check your syllabus or ask your teacher for clarification.