can you give a formula on how to give a grades in exams or quiz?

Answer 1

I would have to give you an "F" on grammar for your question.
However, most College Teachers grade either on a scale of 1) 93-100 A 85-92 B 77-84 C 70-76 D under 70 F; or 2) they use a "bell" curve.

Answer 2

give any amount of points you want for each of the questions (more points for more difficult or more important questions, less points for easier or less important questions), then add the points up.

to figure out your own grade, divide your number of points by the total number of points possible.