If you’re talking about bio 101-102 and genetics and courses like that, my recommendation would be to check out the community colleges in your state. That’s generally going to be the lowest cost way to go, and should be sufficient for what it sounds like you need. I don’t know how much they’ll have moved online, but I suspect that post-covid there’s going to be more available like that than before. Even if you do need more advanced courses, I’d still say to do the prerequisite courses at a community college just to save on the money part of it.

If your employer is paying for it most of the big universities have online courses and don’t require an admissions process for non-degree seeking students, but you’d have to confirm that they’d count as “college credits.”

A local community college would be among the first places I would look at. They typically offer online or hybrid classes and are very accommodating.

Does Western Governors University have biology classes?

Could you enrol in an online program and take courses remotely?

Alternatively does the licensing organization offer the option to complete an exam to demonstrate competency?