Hi Lily,
First of all cutoff for JEE Mains for 2020 has not been released yet. So, this leads to another question whether you have qualified or not.
Second thing is comparing from last year's cutoff which was near about 90 percentile in general also most probably cutoff can vary upto 5 to 10 percentile(down) but still you will not be able to qualify if the cutoff for this year goes down upto 80. And also cutoff for NIT's usually go low upto 95 (last year) so, there's <1% chances for you getting B.tech in mizoram.
But still I wish the best for you.

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