Have a voting event for every position, and have the most voted person for each position win the position for the term/year. Don't allow someone to run for two positions, and don't let the people running to vote.
I propose a bicameral legislature. This makes the most sense since our students deserve to have different ways to participate. One house will represent eleventh and twelfth graders, and the other will represent ninth and tenth graders. All representatives should serve for one year; this will ensure they'll listen to their fellow students. Each legislature will have different responsibilities, so they will need to cooperate with each other.
