THE TEST HAS CHANGED. I prepped fully using existing videos and found that the test had a number of surprising questions. I was very confident for 45 questions, close to the passing line, but I was guessing on the other 15.

This is a warning to anyone taking the Part 107 Knowledge Test for commercial drone work through the FAA after July 2021. I prepared extensively for the test and passed, but with a lower score than expected due to some surprises.

Tony Northrup's great video gets you 60% of the way there:    • FREE Drone Certification Study Guide:...  

Better B Roll is also great:    • Free FAA Part 107 Drone Test Study Gu...  

This guy had a very similar experience to me -- passed but was surprised by the changes:    • Just took the FAA Part107 sUAS exam (...  

This poor guy did NOT pass the first time for the same reasons:    • I Passed the Part 107 Drone Certifica...  

Fewer questions on weather and METAR than expected. Many more questions on Frequencies (reading the charts). It's pulled from a big test bank of questions, so your mileage may vary... good luck!