The kids marched from the school to Seattle City Hall to fight against additional cuts to state education spending.
They say providing a quality education is supposed to be the state's paramount duty and they want students to have a greater voice in the discussion.
"With or without the mayor's support, having 500 kids show up and make a public march and a public rally will 100 percent make a difference. It will spread the word at least," said senior Crawford Cunningham.
Seniors at the school say they can't take as many classes as they would like because of the lack of teachers. They also say the state cuts have slashed science and math courses from the curriculum.
A Garfield teacher was arrested in the Capitol Monday when his protest disrupted a a hearing.