After self-learning Gauss's textbooks, you can start more difficult math learning and competitions, but the specific time needs to be determined according to your personal situation. According to the results of the inquiry on Little Peanut's website, Gauss textbook is a set of systematic Olympic mathematics textbooks, covering all fields of mathematics, including number theory, algebra, geometry, probability and so on. If you have finished the Gauss textbook by yourself and have a certain mathematical foundation, you can choose your own mathematical contest according to your own interests and abilities. Before taking part in the competition, you can improve your competition level by practicing topics and simulating exams.