Elmer X for Mac

From Black Cat Systems:

Elmer creates sample tests to help you prepare for your ham radio written examination. It contains all FCC question pools for each of the three written exams: Technician, General, & Extra. Elmer will grade your sample test, showing you which questions were answered incorrectly. It will also indicate if you passed the exam. Elmer keeps track of which questions you have difficulty with, and will custom tailor exams to help you study.

In the unregistered version, Elmer will have access to only half of the question pool for each exam. Registering will unlock the rest of the question pool.