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i cant make you a speech because i dont know anything about your school but ill give you some points to follow, for you to use as a base for your speech.
-who are you(set context and speak a bit about yourself)
-why do you want to compete for this position (what makes you an ideal candidate for this position)
-what is it that you can offer them so that they vote for you. also, briefly tell them on how you are planning to go about it.
-dont use the word "please"
-give a sweet thank you for listening
confidence and smile is the key while doing your speech. just go on stage, visualizing your victory, that will definitely boost your confidence and ensure you have an edge over others.