Besides :) it's a bad math. Smart boys who'd normally were in grade 5, should get into grade 5+1=6. Dumb boys should get into grade 5-2=3. On average, they shou

Besides :) it's a bad math. Smart boys who'd normally were in grade 5, should get into grade 5+1=6. Dumb boys should get into grade 5-2=3. On average, they should get into grade (6+3)/2=4.5, in other words, they should be held back half a grade. Not one grade.