sentence: Finally , preparing supplementary materials for both the upper and lower levels of students , so that the higher achievers can stay excited and challenged , while the lower achiever can also learn at their own pace of learning .
modified: Finally , preparing supplementary for both the upper or lower level of students , so that the higher achievers can stay excited and challenged , while the lower achiever can also learn by their own pace of learning .
transformation: NOUN, CONJ, NOUN:NUM, PREP