I am submitting my resume for rewriting for Linked In. I am applying to quite a

I am submitting my resume for rewriting for Linked In. I am applying to quite a few Congressional internships and need assistance to make my resume stick to attract internships and employment.
It has to remain one page for I have recently applied to the College to Congress Internship I currently do not know what needs to remain or stay this is the template that I was required to use for College to Congress to view on Linked In.
I do not have a headline or anything else that would be required of me. Please advise of your assistance.