31 is not exactly a low ranking.
You can check Purdue’s class sizes in its schedule. UF does not seem to list class sizes in its schedule, though.
With Florida’s common course numbering system, you are also more likely to know what courses will transfer for subject credit. For Purdue, you can check at https://selfservice.mypurdue.purdue.edu/prod/bzwtxcrd.p_select_info to see if your CC has its courses listed.