The institute is asking for EWS certificate valid for 2021-22

See i think your certificate is not valid for 2021-22. It is value for 2020-21 i.e., upto March,2021. To get the certificate you applied some time before thus your certificate was valid for the fiscal year 2020-21. As you know

Dear Aspirant,

For the last year as per JOSAA website for 6th round of JOSAA counselling these were closing ranks for EWS category for VNIT Nagpur -

Civil Engineering (4 Years, Bachelor of Technology)    OS    EWS      -    4984

Dear aspirant,

I would suggest you to contact the authorities or conducting body for which you are applying because EWS certificate is valid upto one year only.

As you have mentioned that your EWS certificate was valid till Feb 2020 so you need to apply for new EWS certificate because

Dear Aspirant, considering EWS category and previous year trends , having  percentile 97.5+ will create chances for getting seat in  some  top NITs. This may or may not be accurate due varying trends every year and is subjected to various other factors like your home state, branch you want to

Hello aspirant,

According to your percentage, yes there are chances for you to get admission in bsc hons mathematics. The cut offs for these top colleges goes upto 98-97%.

You can check last year cut offs in this link.

https://www.google.com/amp/s/university.careers360.com/articles/du-cutoff

Also, if your family income is less than INR 8

Dear Aspirant, with this percentile CRL rank would be around : 286440 - 322000.

There is one more attempt left for you try giving your best in it, because with such percentile it's  not possible to get into some good college.

you could check your options using these:

JEE Mains

Hello Aspirant,

According to the percentile you have mentioned your EWS rank is expected to be in the range of 2600-2700, you can check out marks Vs ranks Vs Percentile from the link given below :-

https://engineering.careers360.com/articles/jee-main-marks-vs-percentile

Or

You can also use JEE-Main Rank Predictor to predict your rank :-