Hello Aspirant,

You can definitely get admission on the basis of your JEE-Main rank even if you do not qualify for JEE-Advance or qualify but unable to perform well in JEE-Advance. See NITs/IIITs only consider JEE-Main rank for admission to their engineering courses they have nothing to do with your JEE-Advance score.

So even if you don't qualify for JEE-Advance then also you can get admission to different institutions based on your JEE-Main score through either JOSAA counselling or for state autonomous institutions you have to sit for state counselling.

I hope this information helps you.

Good Luck!!