You want to say that you are indicating the marks to point.
e.g., if the student get 83marks out of 100 and you want to indicate that marks into point. right.
if yes, then
first of all you should know that how much marks is equal to point. say 80-100 marks is equal to 10, 60-80 =8, 40-60=6 and so on......
if you wanted to say above one then you can convert marks into points by using queries...