Well Akhila there is no such thing like qualifying criteria in nimcet , you can also qualify with non negative numbers in maths and aptitude , but that  won't do any good. as for getting admission in top nit's you need to get rank around 500 and for which you need to score very high. So rather than asking for qualifyibg criteria , you should think about how to get in good college by getting good rank. 

Thank you.