<p>OP - I don’t do chance threads often…Very unlikely with Columbia, unless you have some very special hook(s). Always view ED as your one free option (option usually costs something), use it wisely. Pick a school you will have a better chance of getting in, otherwise you are throwing it away. With your GPA, any top 20 schools would be a stretch, to be very blunt. If you want ED to help you, then you will need to go lower, otherwise do RD.</p>