The Airmen Knowledge Testing Supplement is a digital version of the handbook you’re given during the Part 107 test. It includes figures that are referenced in many of the questions. We also reference these same figures in our practice tests.
The full version can be downloaded here.
You can see from the cover that this handbook is not just for remote pilots. It’s used for sport pilot, recreational pilot, and private pilot training. What you get is a 113-page book with a lot of stuff you don’t need for Part 107 pilots. Also, the images are very high resolution (probably for printing) making it hard for most computers/devices to render smoothly. So we’ve made our own concise version that’s just 23 pages with optimized images.
Our concise version can be downloaded here.