Tell your seniors: It's not over yet. A few reminders of what he still needs to get done:
Send his ACT, SAT, and Subject Test scores to schools that require them.
Confirm that letters of recommendations were submitted. Write thank you notes to those recommenders.
Confirm that his counselor has submitted a recommendation, school report and transcript to each school.
Notify his counselor that he has added or deleted schools from his list. These folks are not mind readers.
Send a thank you note or email to anyone at any school on his list with whom he has had contact – admissions reps, interviewers, professors he may have contacted, etc.