CEDAR RAPIDS — The Cedar Rapids school board is primed for a shake-up this November, when three incumbents won’t run for reelection. Two of those departing have served on the seven-member board for a dozen years or more: John Laverty will close a 12-year tenure and Mary Meisterling ends 17 years of service. Laverty, Meisterling and Kristin Janssen — first elected in 2015 — each confirmed to The Gazette their plans not to run for reelection. Rafael Jacobo, whose term also expires this year, has plans for reelection, Laverty said. For a school board comprised of members with an average length of service of almost nine years — more than the state average of 5.5 years, according to Iowa Association of School Board data — the November contests could reshape the group that governs the Cedar Rapids Community School District’s budget, superintendent and strategic direction. Two candidates, David Tominsky, 43, and Jen Neumann, 46, already have announced intentions to run. “I see it as an exciting challenge,” said Tominsky, an entrepreneur running for Meisterling’s seat.