Ratchetrex's board-to-board with TheEld

Oh i understand now, thanks for letting me know.

Say you start high school in 2015. You would be part of the class of 2019 because you're there for four years. Dimah and the other main characters began at Corbulo in 2525. They were the class of 2529, despite the planet being ravaged in 2526.

Not an error? the academy fell in 2526 how could be she still be a recruit there in 2529? could you explain please am new.