Many training institutions have both good and bad experiences, and they all focus on classes, doing problems and marking test sites. The key is to rely on your own learning. My friend studied in the official career before, and hesitated when choosing. I haven't heard of it before. I thought it was a small institution with insufficient security. Later, we went to the scene and chatted with the teaching assistants who signed up, and it felt good. All of them are full-time teachers, studying for the public examination for about ten years. The teacher is not good and the attitude is good, but you should consider many aspects when choosing. I suggest that you can listen more when choosing and see if it is suitable according to your own conditions.