Hello
It would be difficult to tell you exactly about the marks required for admission as the cutoff varies every year depending on various factors such as the difficulty level of the exam, number of candidates appearing in the exam, availability of seats, etc.
However, I can provide you the previous year closing ranks for reference and to have an idea about the rank required.
Previous year closing rank of IIT Kharagpur for round 7 for Computer Science Engineering was 73 (closing rank) for SC Category.
You can go through the link below and check the previous year closing and opening ranks round wise-
https://josaa.nic.in/webinfocms/Public/View.aspx?page=71
Good Luck!
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