If a student is absent more than two days from a yearlong credit course, regardless of the circumstances, s/he will be automatically un-enrolled from the course and a "Withdraw" will be noted on the transcripts. For a semester-long class, students may not be absent more than one day, with the same consequences. Two tardies during summer courses will count as one absence. See below for information from the Brentwood School Upper School Family Handbook.
Summer Session: Students have until the end of the second day of the Summer Session to drop a class without penalty. After the end of the second day, Brentwood School records a “Withdraw” on school transcripts when students drop their yearlong credit courses. In all cases, if students drop courses, tuition for the Summer Session is non-refundable.