Question: Under what conditions would a college take back an acceptance?
Colleges do not like to renege on admission decisions but will do so on occasion. This most typically happens when a student's grades drop SIGNIFICANTLY after the student is admitted. In other words, if an A student suffers a bout of senioritis and drops to a B average, it's not a dealbreaker. But if the grades plummet to C's and D's (or worse), it can be. If there are extenuating circumstances behind this change in GPA (e.g., an illness or family crisis), they should be explained by the school counselor. The college will probably be sympathetic and stand by their original acceptance, sometimes putting the student on academic probation when the school year starts.