What's the Name of That Book??? discussion

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Worldshaker
SOLVED: Children's/YA
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SOLVED. YA Dystopian Steampunk where people live on enormous amphibious city ships and teenagers lead a revolution on upper part of the ship. Spoilers ahead. [s[
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The boy is at the top of his academy and has a wealthy family. He eventually finds his way to the lower half of the ship where he meets the girl again along with her companions who make fun of him for being so clean. Eventually, he starts meeting with the girl and her group more frequently and start to make plans for a revolution to allow the people of the lower part of the ship to live up top.
Their plan gets set in motion. At one point, the girl disguises herself as a wealthy young lady and is caught by the boy's grandmother who tries to turn her into a mindless slave. Grandmother gets killed or dealt with. Eventually, the revolution ends with many of the upper half of the ship leaving the ship entirely and deciding to live on the Earth.
The second book picks up where the boy and girl and others are trying to figure out a new leading system for the remaining population on the ship, and eventually get into a war or battle with other groups on land.