On the Dashboard, you can choose to export all of the grades you have given one student.
As part of an assignment, you may give your students an assessment grade or mark. These can be customised by an admin (see Marking formats for more information).
Grades can be anything from a numerical integer to anything that can be contained in a select list. e.g. you could have a number between 0 and 25 or equally you could have a select list showing: Excellent work, Well done, You can do better, See me!
Try experimenting with different marking formats to suit your specific needs.