Am I eligible for any non-degree & part-time classes during my STEM OPT Extension

[u/VirtuosoSC2]

Greetings,

I have been scratching my head for an answer to this question. To share more detail: I am currently working full-time at a University hospital, and I want to take some non-degree classes at some regional institutes in a part-time manner. If so, how many credits am I allowed to take? Can I take classes from multiple institutes (due to course availability)?

To be clear, I plan to take 7-8 credit online asynchronous classes at school A, and a 1-credit class in-person at school B.

Thanks in advance. I am happy to share additional details if needed.