This page is going to be updated over time.
First, remember what a résumé is: a marketing tool for you, the prospective employee, to make a quick impression and land an interview. Also, the most important thing you are trying to convey: I AM QUALIFIED FOR THE POSITION.
You do not have to go into detail about the classes you took, or an in-depth look at your duties as a supermarket cashier. Put past jobs: they show that you have work experience, but unless you can specifically note something useful you can apply toward the actuarial career, drop it.
Remember your audience: the person scanning your résumé wants to know several things: have you taken any actuary exams, what are your technical skills, and when you will/did graduate. The more important something is, the higher it should be on your résumé. Keep it to one page, and be as succinct as possible.
Here's a page on how to write a résumé: http://www.jobweb.com/Resumes_Interviews/resume_guide/how_to.htm
My résumé is organized like this, top to bottom:
Heading (Name/Address/Phone number/E-mail address)
________________________
Objective
Exams
Standardized Tests (SAT/ACT)
Education (most recent school first)
Experience (most recent job first)
Key Skills
Volunteer Experience
Extracurricular