Dear candidate, at 40 marks in JEE Mains your AIR will be around 380000-270000 and percentile will be around 60. Sorry, to say but you can’t get admission in any NIT/IIIT/GFTIs at this percentile, even if you are from the EWS category. You can use rank predictor:

You can take admission in private engineering colleges or state engineering colleges. You can use college predictor:

Hope, it helps!