how to get a best rank in iit or nit what are some tips

@ kalyani 
frst of all , u need organised study , with proper study plan , and 2^nd thing is your doubts , dnt let the doubt to cripple you , clear it as soon as possible , and remember – thses doubt will going to ask in the entrance exams . "
and entrance exams means to confuse the students , so , start early , 
and make sure u have not leave any concept beacuse these will gng to cost you in entrance . 
and last but not the lkeast – dnt rott any concept , jee advanced is concept based test , u cannot solve more than 5 ques if u can manage to cram anything . 
ALL THE BEST ..