Moodle Tools for Learning
All the grades for each student in a course can be found in the course gradebook, or 'Grader report' in Settings > Course administration > Grades.
The grader report collects items that have been graded from the various parts of Moodle that are assessed, and allows you to view and change them as well as sort them out into categories and calculate totals in various ways. When you add an assessed item in a Moodle course, the gradebook automatically creates space for the grades it will produce and also adds the grades themselves as they are generated, either by the system or by you.
The grades displayed are initially displayed as the raw marks from the assessments themselves, so will depend on how you set those up e.g. an essay out of 36 will appear as however many raw marks that student got, not a percentage (although this can be changed later, see below).
Note that various default options for the gradebook are set at system level by the administrator and can be marked as being overridable by you, or fixed. This means that the options will not always be set up the same way for every user when they see the grader report for the first time. see moodle.org