In theory, ability grouping increases student achievement by
reducing the disparity in student ability levels, and this increases the
likelihood that teachers can provide instruction that is neither too easy nor
too hard for most students. The assumption is that ability grouping allows the
teacher (1) to increase the pace and raise the level of instruction for high
achievers, and (2) to provide more individual attention, repetition, and review
for low achievers. The high achievers benefit from having to compete with one
another, and the low achievers benefit from not having to compete with their
more able peers.
Some interesting studies that have been done associating the correlation between physical activity and academic performance in students.
