Park admission is based on a first-come first-served basis; that is, the time of application submission is the basis for determining the priority of booking a bed, rather than by drawing lots. You need to click on your route from the entrance in sequence when applying for park admission, and booking of the beds would be made at the last day of the trip. The system will remind you the remaining number of beds, and how many people have booked the beds, etc. The actual priority of your booking depends on the time you submit the application.