What should I do after being waitlisted by Carnegie Mellon or Columbia?

You should accept the waitlist spot if you would genuinely attend, submit a brief letter of continued interest, and then move forward with another college as your real plan. For both Carnegie Mellon and Columbia, the most useful update is a concise note confirming that you still want to be considered, plus any meaningful new information such as stronger grades, a major award, or a substantial accomplishment since you applied. Repeating your original application, sending multiple messages, or adding small updates usually does not help.

A strong letter of continued interest should be specific and restrained. State that you want to remain on the waitlist, say clearly whether the school is still a top choice, and add concrete reasons the college remains a match for your goals. Then include only real updates: improved semester grades, a new leadership role, a published project, a competition result, or something comparably significant.

For Carnegie Mellon, being direct and academically focused tends to work better than trying to sound emotional or overly broad. If you applied to a specific school or program, tie your update to that area and show continued fit with the curriculum or opportunities there. For Columbia, it helps to show a thoughtful match with its academic environment and intellectual culture, but still keep the message tight and practical.

Usually, one well-written update is enough unless the school explicitly invites more material or you later have a genuinely major achievement. If your school counselor can send a short note reaffirming your interest and readiness, that can help, but it should add substance rather than just praise you again.

Most important, commit by the enrollment deadline to another college you would be happy to attend. Waitlist movement is unpredictable at both schools, so the smartest approach is to stay interested without centering your whole spring around it.