How did you know that you were admitted to Yan 'an University? Text messages or something? The first thing you need to make sure is whether you have been admitted or not. If so, the notice should come down on the 20th at the latest. I suggest you go to the local recruitment office to see if you have been promoted. If so, just wait patiently! The notice will come soon, because it will give you time to prepare, so don't worry!