Be careful not to be nervous, don't speak too fast or too slowly, be sure to interact with students more, make the atmosphere lively, and remember to talk about what you are good at. The salary is definitely higher than that of public teachers. If the contract is signed, it should be countersigned. I don't know how many years it will take. However, if you leave after signing the contract for several years, you will definitely have to deduct liquidated damages. The specific regulations vary from company to company. I hope I can help you and adopt it.