Changing schools; transferring to a different school (often used as the noun 'transfer' or with the verb 'to transfer').
父の転勤で来月、私は転校することになった。
Because of my father's transfer, I'm going to change schools next month.
転校先で友だちを作るのは最初は大変だが、すぐ慣れるよ。
Making friends at a new school is hard at first, but you'll get used to it quickly.
彼は高校で転校を経験し、学習環境が大きく変わった。
He transferred during high school and his learning environment changed significantly.