Setup on fresh Moodle: Login to Moodle as admin Create a course Create 10 users, with ID number set to user001@example.com through user010@example.com (see provided CSV if this enumeration is unclear) Add these users as Students on the course Create 4 manual grade items named Quiz 1 through Quiz 4 and worth 2, 1, 10 and 10 points respectively. Testing: Click on the Grades link in the sidebar settings panel On the Grades page, select 'Import from CSV' from the drop-down select at the top of the page Upload the attached CSV with a million+ "blank" rows in the useridnumber column (This is a common problem when Excel creates the CSV). Map from User ID Number to useridnumber Map the grade columns to the grades items created in the setup. Ensure that your request completes without timing out. Inspect the grade_import_values table to make sure that it is empty after the process is complete.