Just as students must correct mistakes in assignments and Spiral Review, students correct errors on exams after the teacher has saved grades.
Corrections for an exam are an assignment and are enabled by default. Teachers must save the grade for a student or the class to generate corrections.
From the student's view, corrections are an assignment to choose.
NOTE: Students may not use 'Need help?' for Corrections. 'Need help?' is grayed out for Corrections.
Teachers may view completion of Corrections from Exams > Corrections.