I like the format of the WhizLabs tests. It seems to be a fast way to study and pass certs since you can just review the questions you got wrong and they have documentation excerpts/links.
Udemy has a lot of good stuff, particularly programming-related. I’ve learned a lot from it. They have a sale every few days, so if you wait, you can pick up hours of content for <$20.
France Université Numérique has thoughtful content in both English and French.