There are two types of reports that will give data and performance information for students within a teacher's classes.
Downloading an Individual Student or Class Report:
A course progress report for individual students or classes that will provide you all reports for a date range you specify.
Downloading Assignment Performance Report:
A downloaded Performance Report will be for a specific assignment and include the following: students first and last name and Id, overall score on the assignment, time spent (in minutes) on the assignment, and individual item scores.