I went to their institution after taking the safety test, and it was still very reliable. Anyway, it went smoothly from registration to the end of the training. Their teachers are very professional, their knowledge points are in place and their answers are timely. The teachers drew the key points accurately. I can remember almost half of it after listening to it. In fact, as long as I understand them, it's not that difficult, but it really takes a lot of time and energy to study hard and learn by myself.