FAA sUAS study guide: https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/media/remote_pilot_study_guide.pdf

FAA Part 107 Small Unmanned Aircraft Systems (sUAS) Training https://www.faasafety.gov/files/helpcontent/courses/sUAS_5095_lms_2/menu/index.htm
UAG Test Prep (via Sarah Nilsson, JD, PhD, MAS)
http://www.sarahnilsson.org/aviation/uag-test-prep-1/
FAA Remote Pilot Study Guide https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/media/remote_pilot_study_guide.pdf
The Pilot’s Handbook of Aeronautical Knowledge (2016)
https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/media/pilot_handbook.pdf
Aeronautical Chart User’s Guide
https://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/aero_guide/media/Chart_Users_Guide_12thEd.pdf
Skyvector Online Aeronautical Chart
https://skyvector.com/
Pilot Training System – UAS/Drone Pilot Training Video Series
https://www.youtube.com/playlist?list=PLdu8cMWoatm01MnJ4XnxrJeld3FZbe4ia
Airman Knowledge Testing Center List
https://www.faa.gov/training_testing/testing/media/test_centers.pdf
Integrated Airman Certification and Rating Application
https://iacra.faa.gov/IACRA/Default.aspx