In the Enrollment Summary screen you can gain an understanding of where your enrollment and re-enrollment status and numbers are.
You can access this screen by navigating to your domain/admin/analytics/summary.
At the top, the pie chart breaks down the prospective re-enrolling students by status:
Not Sent: Students who have not yet responded to re-enrollment communications
Pending: Student who hold pending re-enrollments
Confirmed: Students who have confirmed re-enrollment
Declined: Students who declined re-enrollment
Beneath the Re-Enrollment summary, each prospective student is listed. Buttons on the right allow admissions admins to adjust each student's status. Use the dropdown menu to select which grade each student will enroll into.