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Not a very good test. Too easy to guess many of the words, and the words seem to follow a theme. For example my list had five or six that had to do with speaking too much or too little (verbose, lugubrious, and a few others in that vein). And many easy words were placed late in the test (e.g. zeitgeist, facetious being in the expert and grand master categories?).

And it didn't even tell me at the end how many words I know!

There is a similar variant of such a test where you just go down a list of words of increasing obscurity, ticking the ones you are familiar with. If you do this once or twice, you can get a fairly good estimate of the actual number of words you know.