If my expected marks for JEE paper 2 is 122, do i have a chance to get admission in govt. College?
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As far as i know your score is too low to fetch you any NITs.You can use the below given link to check cutoff details for B.Arch and B.Planning course through jee mains paper 2:
https://engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning?amp
Good luck.

JEE Main 2025 College Predictor
Know your college admission chances in NITs, IIITs and CFTIs, many States/ Institutes based on your JEE Main result by using JEE Main 2025 College Predictor.