Note machines you can run, tests you can do, software programs with which you are familiar. Do not staple or fold. Specific Employers are most interested in specific accomplishments. Use facts and numbers. You may want a section just for Special Skills to highlight computer skills, language proficiency or tests you can administer.
Employers also like to see leadership and teamwork demonstrated through activities and sports.
If your GPA is 3.5 or higher, put it on. You may want to have a section of relevant coursework. Don't include high school unless you are a teacher applying to that district. You may hand the reference sheet over at the interview, but you probably don't want to send it to just anyone. Include if related to the job you are seeking.