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Are you asking about the TRUST test or the Part 107 Certification Exam? If you’re talking about the TRUST test, you don’t need to take any courses…the TRUST test IS a free course (with a test at the end) that you pretty much can’t fail.
If you’re talking about the Part 107 exam…obviously, this site has a course that is pretty good (if you’re a paid member) and a practice exam that I’m pretty sure is available for free.