Do private schools admit students throughout the year?

Most private schools will admit students during the school year if space permits. The availability of openings can be unpredictable, and schools without rolling admissions usually refer to their waiting list when an opening arises. 

It’s always worth asking if the school is currently accepting applications for entry into the active school year. Just be aware that financial aid is likely unavailable as the school has already allocated the school year’s funds to admitted students, and schools may be reluctant to admit international students mid-year.