Hello there,
The cut-off percentile for NITs for SC-PWD candidates is quite low, less than 1 percentile. Since you have got 39 percentile, yes, you are eligible. Also, the cut-off rank changes every year depending on the difficulty of the paper and the number of candidates appearing for it. You have good chances of getting admission in any NIT.
You can also use our college predictor:

Hope this answer helps you.
Good luck!!

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