Do you vaguely wonder how well you remember a language you half-learned a while back? Try the Proficiency Tests provided by Transparent Language. They’re not very hard (I got 97/150, or 64%, on Latin, a language I was getting rusty at almost 40 years ago), but they don’t take long and are quite enjoyable if you enjoy that sort of thing. (Those of you who still have nightmares featuring multiple-choice exams should probably tiptoe on by.) A tip of the pileus to Des for the link.