There is not a query field that looks for this information. However, an Export can list multiple education relationships and then the output sorted by the Class Of year.
  1. In a constituent Export on the Output tab, select Relationships > Education > Class Of.
  2. In the setup window, enter the number to export as 2 or higher in the top right.
  3. Still in the setup window, select Class Of and Descending for Order by in the lower right.
  4. Update other settings as desired.
  5. Click OK.
  6. Set up the export as desired and run/save. In the exported data, the first column of Class of will be the most recent.

OR

If the RE:Alum optional module is present and the Primary Alumni Information is always set to the most Class of record, then output Primary Alumni Information > Class of in a constituent query.