Hello,
For general rank cutoff for JEE Mains will be around 1k or below 1k. With reservation it will go up to 2-3K. But it varies with year and it depends on average performance of candidates and how the paper was.
But in general a rank below is a secure place else you need reservation to get into a NIT college. If you go for low ranking NIT a rank below 4-5k is considered with reservation and for general it will be below 2k.
You can get the rank list from JEE board or the basic rules and regulations followed for different reservation categories.
Hope it helps!

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