For example, you can see in the screenshot below that, for UMS05 undergraduate students, the Academic Level of JUNIOR is set to apply to students with 54 or more credits (and fewer than 84 credits).
If you would like to see the full list of the rules for all UMS institutions and careers, create a query with ACAD_LEVEL_TBL.
Data Dictionary Links
Clicking the linked (blue) fields in any table will take you to the Data Dictionary and provide you with more information about that field as well as field values if they are available.