To test a drone flight license, you must go through a formal training institution before you can register. After the training, the organization will register, and you can take the exam once a month, as long as you reach the exam level.
There are three kinds of training for UAV driver's license: plant protection, in-sight training and over-the-horizon training, starting with theoretical training, including safety regulations and UAV principles. And then master the skills of using the remote control by flying through the simulator.