Hi,

Well to be honest, if you plan to do PhD from abroad then you should try to get into IITs or any such premier Central University like JNU or BHU or DU. Because that matters as you will need to do a lot of good lab work before you apply for admission abroad. I would suggest you to give the exam again rather than settling for nit as the faculty and research facility is very weak in NITs. So choose wisely.

All the best.