Hello Shubham,

Actually, your score should be 75% or in top 20 percentile in your class 12th exam conducted by your respective board then only you can get admission in NIT colleges and you can give the JEE Advanced examination.

For more information, please go through the links given below

https://engineering.careers360.com/articles/jee-main-eligibility-criteria

https://engineering.careers360.com/articles/jee-advanced-eligibility-criteria

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All the best.