Respected Sir,
You need to get more than 300 marks to get an scholarship and get into top NIT's if that's what you are asking. Technically, there is no such thing as free seat, you would have to pay something as a down-payment for blocking a seat. This fees would be quite low and nominal though.
Hope I was able to help you.
Thanks for contacting Career 360.

There is no free seat into IITs.

There is akways safe score andrnak which guarantees tou seat into all IITs.

Top 1500 ranks can get seats into all IITs.

https://engineering.careers360.com/articles/jee-advanced-rank-predictor

https://engineering.careers360.com/articles/jee-advanced-cutoff

However, you can avail scholarship to save yiur fees.

https://www.ndtv.com/education/rs-75-000-scholarship-for-bright-minds-from-iit-iisc-universities-important-things-to-know-1751435

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