Find a fresh way to talk about your interest in their school or scholarship.
Leadership is better than membership. SO MENTION IT
Revise your essay
Plan to revise your essay several times.
Read it to someone else to see if you have communicated according to your plan.
Rewrite general or cliché statements to reflect you, specifically you.
Use concrete, specific examples of when you have demonstrated the qualities you say you have: hard working, dedicated to community service, interested in biology, prepared for a rigorous course of study, a good citizen.
Edit Your Essays
Make sure your essays are without errors.
Carefully and neatly fill out the forms that the school or group provides.