1. First of all, you can get detailed information about the preparatory class through the contact information of official website of Jilin University or the Admissions Office. Understand the admission conditions, curriculum, tuition and other related contents of preparatory classes.

2. Secondly, log in to official website of Jilin University and complete the online application within the time period specified by the admissions department. Fill in the application form according to the guidelines provided by the website and upload the required materials to ensure that the information submitted is complete and accurate.

3. Finally, according to the requirements of Jilin University, complete the payment of the application fee and wait for the examination and admission results.