How to set up the "custom" grading type?

Custom grading enables you to adjust the list of grades used during the school year and their counting into average.

If you award the student grade A, for example, it will count into the average with a numerical value set in the "Value for average" column.

The final grade calculation can be set too.
Final grades can be expressed with numbers or with a text. Indicate decimals with the dot symbol.