how to improve your study habits中有一句不解

how to improve your study habits中有一句不解
Perhaps you are an average student with average intelligence.You do well enough in school,but you probably think you will never be a top student.This is not necessarily the case,however.You can receive better grades if you want to.Yes,even students of average intelligence can be top students without additional work.Here's how:
This is not necessarily the case,觉得好奇怪?这不是必须的?矛盾