Grading in education is the attempt to apply standardized measurements of varying levels of achievement in a course. Grades can be assigned as letters (for example, A through F), as a range (for example, 1 to 6), as a percentage, or as a number out of a possible total (for example, out of 100).In some countries, grades are averaged to create a grade point average (GPA). GPA is calculated by using the number of grade points a student earns in a given period of time. GPAs are often calculated for high school, undergraduate, and graduate students, and can be used by potential employers or educational institutions to assess and compare applicants. A cumulative grade point average (CGPA), sometimes referred to as just GPA, is a measure of a student's performance for all of his or her courses.