As the competition is very tough among students therefore they can’t miss any single topic in JEE Examination. But it is very difficult to revise the complete syllabus just before the examination. Thus, students must focus only on the chapter notes/study notes before few days of the exam. Here, we are going to provide study notes of Centre of Mass including topics like centre of mass of two points system, centre of mass of n points system, impulse, thrust etc. Students always get 1-2 questions from this chapter in the exam. The concept given in this article is in very concise form and can be used for revision. Some questions are also given in these notes which help students to understand any topic easily.