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The candidate must have secured at least 75% marks in the aggregate if he or she is belonging to general category. However if the student belongs to reserved category then the minimum required percent are 65.
For more: https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/colleges/list-of-top-iit-colleges-in-india&ved=2ahUKEwi8jOjgzanzAhU57HMBHUBVANAQFnoECAcQAQ&usg=AOvVaw00Z3VfGv0fXBEIh8Sl1kgQ
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