Hey there, Marshy7!!! I have a few suggestions for you.... I will put in red, the phrases that don't really belong under "objectives" The works in blue are strong, so definately try to keep them around.  Also, your objective should only be one sentence, two at max. 

Talented and Dependable Administrative Assistant seeking employment with the ABC School District. 

(That should be your "objectives" statement) Obviously, if you are applying with other companies other than ABC School District, you could say something like "....seeking employment in the field of education"

 (I have) dont really need that )  15+ years office experience with corporate and nonprofit organizations. 

Superior multi-tasking skills, detail oriented and (proven confidential character). The part in parentheses is difficult to understand, try re-wording that part

This should go under the heading of Experience, then list Company, followed by what you did there, which might be :Coordinated several large events while maintaining daily office responsibilities.

Good Luck!

Jessica