Hi,
     Yes you have chances in the lower NIT'S. As you your are from ST category, you have chances in NIT Mizorum, Uttarakhand, arunachal pradesh. Look according to previous year's cutoff, it seemed to be that you should get NIT Mizorum, Uttarakhand & arunachal pradesh for sure. Just wait for last round of counseling & also do counselling well, this is must. How you arrange your choices.
After the 7 rounds of counseling, there is 2 special rounds in every NIT'S. There cutoffs has gone down. Look in the end, many seats are free every year. So if wait till to last, then you should get definitely. So in that way you have also chances in NIT Sikkim, Meghalaya, Manipur & Puducerry.
Look cut off varies every year. Your rank is not that good, you get the colleges firstly but if you can definitely get. & as I told colleges under counseling, if don't get NIT'S through normal counseling, you must wait for special round. You can definitely get a seat in those colleges.

Good luck!

Yes definitely you can get nits.

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