There are many websites of Big Data Contest, such as the famous kaggle abroad, the Tianchi Contest of Alibaba in China, and the DataCastle of Professor Zhou Tao. DataCastle is the largest data science competition platform in China. It seems that many companies and organizations will post data and questions on it, and then you can register an account and choose a competition. As far as I know, there are many students participating in the competition now, and many of my classmates have gone (Electronic Science and Technology University). Before the seniors went to the competition, they directly signed the corporate offer after graduation.