I would check out Mathnasium. They won't do an actual prealgebra course but will cover the concepts.

Looking for an in-person (pre)/Algebra course taught on weekends, evenings or over the summer. I would prefer not to use Kumon or online courses (e.g. Khan Academy). I thought about tutors but would prefer a classroom setting. Any leads would be greatly appreciated. Thanks in advance.

Note- I considered posting in the classes/camps section but observed that there is less likely of a response if it pertains to Prince George’s County.

Thanks!