Hii Aakash it depends on the branch you wish to take and your category as well.But for an idea you can take it as 165 for gen.It would be better if you could tell me your category and branch you wish to get,so that I could answer you accordingly

It is quite difficult to tell the exact range as the cut off varies year, category and branch wise and there is nothing announced for Jee main 2018 cut off but as per previous years information, to get seat in lower/average NITs it would be better to get 150 or above but if you wish to get seat in top NITs and in top branches like CS,ME, ECE etc then better to get 230 or above. So plan and prepare very well so that you can easily get admission in your desired NIT.

Hope this helps!!!