Hello student,

May be the syllabus for IIT Jam and other insitutes look similar, but they are not the same. You see, for example, when you take a particular subject like mathematics, then, the basic concepts and syllabus will be the same which would make you confused. But, thats not a problem. It is one of the toughest exam to crack, and has overlap with the portions of other university exams too. 

Good luck