Ask HN: online exam/testing software or service?

i've been searching for a little while now for something that fits my needs, and i figured i'd ask HN to see if anyone has any thoughts or recommendations.

i need some sort of robust testing software or service. i need the ability to enter in a test with text, picture, and video-based questions, charge people to take it, have it automatically grade itself, and then push results through various methods (email, text, and/or an api).

does this or something like it exist? the closest thing i've seen so far is some of the modules that exist inside of moodle, the e-learning software suite.