If you were deferred in December, your file moves into the regular round and will be read again. February is the strongest moment to write: first-semester grades are final, and committees have not yet made their decisions.
Deferred applicants are admitted at meaningfully higher rates than waitlisted ones — roughly 5 to 20 percent at highly selective schools, against 3 to 10 percent from a waitlist. The letter still changes a committee re-read. This is worth an evening.
One page. Four short paragraphs.
Through the applicant portal if there is an update form — several schools require that channel and ignore email. Otherwise email your regional admissions officer, who is listed on the admissions site by territory.
Do not skip the letter. Acknowledge it in one sentence, without excuses, and say what you have changed. Silence after a visible drop is worse than an honest sentence.
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