I used the prep course from Drone Launch Academy (Drone Pilot License - Drone Launch Academy) to prepare. They were significantly cheaper than most other courses ($125 including a coupon) and they offer your money back if you don't pass the first time provided you make at least 80% on one of their practice tests. So far, I've made a 96, 100 and 98 on three different practice tests. After you plow through the detailed course, they have an excellent study guide and I also like their optional flashcards to help prepare. I'll report back on the FAA test results ....
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