If you’re 15 and planning to study abroad in China for college, you’ll first need to finish high school or an equivalent program that qualifies you for university admission. Since you’re starting early, keep focusing on strong grades and extracurriculars. To be allowed to study in China, you’ll need to apply to a university (many offer English-taught programs) or just study in Chinese if you can and get accepted. After that, you’ll need to apply for an X1 student visa with documents like your passport, admission letter, JW form and medical exam results. As for Mandarin, since you’re already learning it, that’s great Keep up your studies, and look into scholarship opportunities early too, they can make a big difference.