College Application Essays Word Limit

Some college application supplemental essays specify approx. words limit only. What is the advice, by how much can one exceed this limit? Is 10% acceptable?

My students were advised by counselors to try even to go under word limit, because adcoms appreciate brevity. But in some cases, they went over, and when we pre-printed before hitting the submit button, they accepted the overdraft. Yes, I think 10% is acceptable, but always take a hard look. Do you really need to go over? Brevity counts. Sticking to rules and limits counts.