The goal is to give reference points for the jumerical scale so the numbers can be more meaningfully compared, not necessarily to have a detailed reference that will annoy some people (too much to read) and confuse others (don't fit in).

I was thinking of something intermediate, like "took specialized classes, not 101", but I'm afraid being too specific about education means people will not take into account other things like how much they forgot or how much they learnt in the meantime. Someone who took econ 101 but works in a bank and argues about economic policy on the internet everyday and read a few good books is probably more knowledgeale than someone who majored in economics and then said "screw it all" and became an actor.