1. The content of Level 2 exam is: theoretical knowledge, practical exercise and synthesis.

2. The content of Level 3 exam is: theoretical knowledge and practical operation.

Training content * * * There are two books: basic knowledge, skills section and an exam guide (problem set).

Level 3 self-study is ok, level 2 is not so easy. For the third level, if you just want to get a certificate, passing the self-study exam is nothing. In practical work, there are many things that can't be seen in books, and teachers will talk about many things that are not in textbooks, further extending many practical examples. This knowledge in the classroom can't be learned by reading by yourself, and you can't grasp the key points by reading by yourself, so the efficiency is not very high.