Any tips for highschool?

Im 15 and in a couple of months im going to be moving to japan for 10 months for my first year of highschool. Im chinese-mexican (chinese born and living in mexico), so im fluent in english, spanish and chinese, but ive been studying japanese for 4 years and about to take my JLPT N4. Im honestly very nervous because even here ive never had the most positive school experience, and im not the most extroverted person. Any general life tips for school? Anything I should expect or look out for from classmates there?

EDIT: Im in an exchange program and going to be staying with a host family. Im not going to be put in an international school from what ive been told, just a “normal” highschool. Sorry for the confusion

by anonymousrnx