All your testing answers and requirements are on your state web site.
ProMetrics does the testing at multiple locations.( I remember seeing them when looking for locations in
MA).
As far as online, I used testteachersonline.com...which was very good. I don't see Mi listed on their site, but you could email or call them and they might have an affiliate.For me, the best practice test give the answer with the rationale behind it so you understand why you are wrong.
You can check with your local insurance agents orgs for help