HELLO ADITYA
MNNIT ALLAHABAD is a very good and reputed NIT so in order to get admission into this college you would need to work hard. Since you have a obc category and home state quota so you have a upperhand.
now looking into the previous year cutoffs the percentile required for general category would be 99.6 so according to your category it would be greater than 98.5+ just to be on safer side well if you manage to grab a percentile above 99.6+ you can get into almost all top NITS .
you can use this link to get an idea of previous year cutoff of MNNIT.
https://engineering.careers360.com/articles/jee-main-cutoff-for-mnnit-allahabad
HOPE IT HELPS!!