I took the test on Friday, 9/2. As of 9/3, the results haven't been posted to FAA. I suspect that the "48 hour" thing will mean I won't see results until AFTER Labor Day weekend.
At any rate, I passed with 82%. It took me about 50 minutes, including 2-3 times running through each question to confirm answers. All of the questions are three-part multiple choice. Some of the questions are "tricky," (or would be if you haven't studied and don't understand the difference between MSL and AGL, runway designations, compass directions, radio frequency labels and purpose, etc.)
I would classify the test as somewhat difficult in that most of the questions required at least some rote memorization of rules, distances, weights, heights, and procedures. The only reasoning was in answering the questions by eliminating answers that seemed illogical. There was some simple math that did require a good understanding of weather, sectional charts and other topics.
There is no subject on the test that is NOT mentioned in
FAA-S-ACS-10 Remote Pilot – Small Unmanned Aircraft Systems Airman Certification Standards. Become familiar with the items referred to in this. Be prepared to answer questions in any area of this document, but don't be surprised if you don't get any questions on any particular topic. (For example, I studied for hours on METAR/TAF codes and got NO questions on METAR/TAF. Others had several MATAR/TAF questions. Be prepared!)
During the test, you are given a printed copy of the "Airman's Knowledge Testing Supplement for Sport Pilot, Recreational Pilot, and Private Pilot." This is available online.
I'd highly recommend that you familiarize yourself with every page (except the airplane instruments). Many of the questions refer to the supplement. If you review the supplement and work through the given airspaces, weather and airport printouts, etc you will find parts of the test a bit less of a surprise. There is also a legend for the sectional maps at the front of the book that will provide a tiny bit of help.
I spent about 30-40 hours studying the recommended resources on the FAA site, plus found a couple of other free online sources of information. The only thing I purchased was this book "
The Pilot's Manual: Ground School: All the aeronautical knowledge required to pass the FAA exams and operate as a Private and Commercial Pilot"
https://www.amazon.com/gp/product/1560276770/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1 This book helped me by providing a less lawyer-like wording of the rules than that contained in FAA documents. (It had ZERO on drones, but was helpful on weather, airspace, radio, and airport procedures. I shoulda read the chapters on load balancing, etc).
Despite my studying, I had to guess on 11 questions.
I had questions on winged aircraft center of gravity, topics I had totally skipped because I really didn't realize there were winged drones.
There were MANY questions that required knowing specific numerical values, and a clear understanding of the concept of "greater than, less than, less than or equal to, greater than or equal to." (No number mentioned in the study materials or UAS regulations is off-limits).