A brother of our school has gone to Xinjiang as a volunteer, and I plan to go, too. I just haven't signed up today. Whether the competition is fierce or not depends on your school situation. Generally speaking, each school has a certain number of places, which are then allocated to various departments. If no one in your department wants to go, the competition will not be fierce, so you don't need to take exams, just review. Specific requirements of volunteers can be obtained online. Of course, the development of the west is not as good as that of the mainland, but these are relative. If you want to go there to experience life and make some contributions, you can go there and be mentally prepared. Such as language problems, food problems and climate problems. Don't deliberately prepare books and materials, look at relevant policies. I hope it helps you.