No Progress Appearing After Student Completes Pre-Test

My students have logged in and completed their pre-test but when I view their progress report I see "No Data Available".

A student's progress report begins reflecting data once the student has completed the placement pretest and at least one full-length quiz on top of that. If your student has not yet begun completing any full-length quizzes, this explains the absence of data. The progress report will automatically update once they complete a full quiz.