You can create a list of users who have been given the Alumni role without having attended the school in 12th grade (or whichever grade students graduate from.)
  1. Navigate to Analysis > Manage Lists
  2. Click the Manage basic and advanced lists block under List Actions
  3. Click Add > Create Advanced List
  4. Under Select Objects, select the following objects:
    1. Constituent Information > User Base
    2. Constituent Information > User Role
    3. Constituent Information > User Register (Un-mark Inner Join)
    4. Platform > Grade Level
    5. Constituent Information > Parent/Child Relationship (Un-mark Inner Join)
    6. Constituent Information > User Base
  5. Select the Display Fields tab
  6. Click Select Fields
  7. Mark which fields to display
  8. Click Select
  9. Select the Filters tab
  10. Add the following Global filters:
    1. User Role.Role any of Alumni/ae
    2. User Register.Student User ID is null
    3. User Base.Grad Year any of [select Grad Years for students who would have an enrollment in 12th grade]
  11. Add the following Object filter:
    1. Grade Level.Grade Level Description any of 12
  12. Name the List and select a Category (if needed)
  13. Click Save
  14. Click Preview