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No. Assume parents are in Canada on work or study permits. If not, most go to private schools.
 
but are international students allowed to attend public high school in Canada
With an approved study permit, yes. To apply, the public school board gives permission to enrol, has Canadian custodian, show the funds for tuition fees and living expenses, ties to return etc. A student cannot work in Canada and is on own without parents so is Canadian custodian is responsible.