Hello Manoj

JEE Main exam is being conducted by NTA twice a year for the first time and it would be difficult to tell you about the percentile required for admission.

Percentile cannot be predicted as of now. However, you can go through the link below and check the previous year cutoff of NIT Hamirpur for reference-

https://engineering.careers360.com/articles/jee-main-cutoff-for-nit-hamirpur

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Good Luck!