1. The time to prepare for advanced interpretation depends on your foundation and the efficiency of your preparation process. Generally speaking, advanced interpretation is more difficult than TEM-8. In the state of careful preparation, I think it is more appropriate to spend three months to six months.
2. There are four textbooks needed: advanced listening course, advanced reading course, advanced translation course and advanced interpretation test compilation. Of course, advanced interpretation is divided into written test and oral test. What I just said was preparing for the written test. You can't take the oral exam until you pass the written test. The oral test requires two other books: Advanced Oral Course and Advanced Interpretation Course. In addition, you can get a written certificate by written examination and a general certificate of interpretation by oral examination.
3. How to make a high mouth. To tell the truth, it's still quite difficult to say high. I took an advanced course in Suzhou. It is a training institution with a good reputation, called Egler. Although I didn't have much confidence in training before, there is a big difference between attending classes and not attending classes. Many of the methods and skills taught by the teachers there are very clear, otherwise I don't have a clear idea to do the questions myself, especially those special questions in high-level courses that are not available in other exams. There are also some special eight, but similar questions in Gaokou are more difficult. My experience is that I need three things: strength, skills and training.
I hope it helps you.