Glad that you realize he needs more secular skills to make a good parnassah. Too many bochurim need remedial classes and never get them, which really handicaps them in the job market. I’m not too sure about doing them online – the interaction between prof and student is important, but if there aren’t any other options, it’ll do. And watch out for for-profit colleges that promise a degree/certificate in a couple of semesters. They aren’t accredited in the “real” world. Mostly they get you to take Pell grants and loans to pay them and then leave you without any good credentials.
Reconsider doing a law degree. The field is already over-crowded. Children of some of my friends have done law school and then had a terrible time finding jobs. And stay away from real estate, financials, etc. I have friends who lost their jobs and everything else in the 2008 crash, and don’t believe that there won’t be another. They come around every ten years like a lunar eclipse.
Touro College in New York City has a good reputation. They probably also have online courses. I would assume they also have career counseling, so he can find a field that’s a good fit and not over-crowded.
And it might be a good idea to take a year to focus on finishing his secular education and starting serious college work. Trying to keep up a full-time beis medrash schedule and still do well in college can keep someone from doing well in either. Let him learn how to keep up a good learning schedule outside the yeshiva and learn to manage his time well. That’s a skill he will need no matter what field he goes into.
Good luck to him!