Hello Deepika,

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

Thanks for query on this platform, you may visit again for further queries.

All the best.