Should parents have the right to know their childrens school results?

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For example a family pays for their child to go to a private school. They complete their senior exams, the results of which are organised by the state and provided to the statement via mail. The school also gets a copy of the results. The student chooses not to tell their parents their results so the parents contact the students teacher who is able to tell them. The student then gets very annoyed about it and claims that their results are none of their parents business and the school should not have told the parents. I personally think that under the circumstances it is a reasonable request on the part of the parents, the student is under 18 and the parents are paying for their education.