Update: I took the JMP Associate ... actually just because I liked the course so much (and I solemnly believe that it is an excellent starting point). I can confirm that the sample questions are pretty comprehensive and reflect the degree of difficulty to expect well. So I think, one does not need a prep exam for preparation.
Just one remark: The interactive/practice part is surprisingly large, so one should not expect a standard multiple choice test. (This is as of Dec '22, the exam will undergo a review, see @beccagre above).
Hope this helps.
Kind regards FJa PS: Yes, I did succeed. 😉
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