I would like basic short answer/MC tests for Lesswrong content. I have not been through a lot of sequences but I have been around people that have and been in discussions about those sequences, and I have also read a lot of important posts from sequences that I haven't read entirely. I would like to know if I actually know the material. It can also be a good teaching tool in itself (see the comment on pretests), and it can also assess knowledge of Lesswrongian terms and phrases.

Even if it doesn't really test one's skill as a rationalist, they can still be incredibly useful.