Hello Nitish,

Actually, you have to score 75% or in top 20 percentile to your respective board in aggregate & 50% marks in PCM individually in the 12th board examination after that only you can get an NIT college or give the JEE Advanced examination to get IITs.

For more information, you may visit 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.