I've done quite a few courses in wines and spirits (WSET, CSW, CSS) and certified through US Sommelier Association. They can be hard if one is not in the industry and tasting daily. (Especially WSET)
For folks who are "eager amateurs" of French wine, the best course I have done is through the a french Wine Society. They run weekly lectures and tastings for 13 weeks (quite in depth) with a multiple choice exam at the end (no tasting exam) - they also do immersion courses in France. I'm currently trying for their Bourgogne Master level. It's a lot of fun, and I hope to head to Burgundy next summer just prior to that exam.
Anyone who is a fan of French wines needs to check this out:
https://www.frenchwinesociety.org
HIGHLY RECOMMENDED!