You want to include your academic accomplishments, but this is secondary. Demonstrate how that internship will help further your professional goals. Highlight the qualities that make you right for that job. If the job involves sales, you want to stress your ability to get along with people. If the job involves research, emphasize your powers of concentration and persistence.
Final Comments Be honest.
Be confident and positive without being pushy or demanding. No one ever writes a perfect first draft. Do not be discouraged if you are not accepted. Be constructive and analyze the possible reasons for your rejection. Maybe it really is not the right program for your goals.