Can I get my GED online? Or only in person?

I’m trying to get my GED, I live in Southern California. The reason for me trying to get it is because I’m really trying to donate my eggs to those in need, and the only way is if I have a diploma. So I’m going to get my ged.

Now i don’t know how it works online, so can someone tell me how it works? I’m hoping I can do it online, because I was going to have my sister help me (I’m extremely bad at math) 🤦🏻‍♀️