English term (edited): A, B, C

I think that it depends on the country (and, within the country, the region) but in the U.S. most schools consider an A to be equal to a grade of 4.0, a B to be equal to a grade of 3.0 and a C to be equal to a grade of 2.0. HTH.

--------------------------------------------------
Note added at 8 mins (2007-05-27 19:23:44 GMT)
--------------------------------------------------

If you're referring to counting down from 100 then 90 -100 (more or less) is usually equal to an A, 80 -90 is a B, 70 -80 is a C, 60 -70 is a D and below 60 is an F.

--------------------------------------------------
Note added at 19 mins (2007-05-27 19:34:44 GMT)
--------------------------------------------------

Here's a link (one among many) that gives you a clearer idea of what many schools do. http://www.washington.edu/students/gencat/front/Grading_Sys.... This one is applicable to the 4.0 - 1.0 grade scale, I'll see if I can find an example of the other (60 -100).

--------------------------------------------------
Note added at 21 mins (2007-05-27 19:37:12 GMT)
--------------------------------------------------

Here's an example of the second one http://users.ipfw.edu/blythes/teach/grades_how_calc.htm Hope this all helps to more precisely answer your question.