On the Model screen in Nova-T6, use CTRL and UP or DOWN arrow to change the order of the years. This will correct the order on the Transfer Curriculum screen too. It also changes the order in which the schemes appear in the browse on Curriculum Assignment by Scheme in SIMS .net (though not for Dual Timeables).
On the bands screen, use F6 to toggle the order in which the years is displayed
The order of subjects within a block follows the order in which they were placed in the block when the block was constructed. This cannot be changed except by re-construction the block.