You seem to be misunderstanding something. Apparently those are not considered to be excused absences. As well, you refuse to address the additional five absences.the question is if they can base my grades off of absences that were excused for illness because of direct contact to the school from parents,
Just having your parents contact the school does not typically make an absence excused. Even if it did, it would appear the principal feels the initial determination was improper and as such has rescinded the action of excusing the absences.
Does your school have a policy in place regarding absenteeism and grades?
the basic answer to your question is: yes, they can.
Now, if you disagree with the decision, you need to explore means to appeal the decision as your student policy allows or possibly approaching the school board regarding the principals actions.
So, care to state how the 9th amendment proclaims a right to an education?

