To schedule an appointment at an FAA Knowledge Testing Center near you, go here. Additional information about test-taking requirements (such as valid forms of ID and anything else you need to bring) can be found there, too.
An FAA Tracking Number (FTN) is required in order to schedule a test appointment using the link above. The IACRA web site is the only place to create or locate your FAA Tracking Number.
As of August 2016, anyone operating a drone for any commercial or business purpose must obtain an FAA remote pilot certification. The remote pilot knowledge test Unmanned Aircraft – General costs $175, includes 60 questions, and requires a passing score of 70%. With successful completion of the test, you can apply for a remote pilot certificate for FAA Title 14 Code of Federal Regulations part 107.