Hello student that depend on your board if your board allows you to appear in single paper for improvement then you can give it to single paper. As eligibility criteria says.
NITs/ IIITs/ GFTIs Admission: Candidates should have obtained a minimum of 75% marks in class 12 or equivalent exam or they must be in the top 20 percentile in their class 12 examination. For SC/ ST, the eligibility is to obtain a minimum of 65% marks in class 12 or equivalent.

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Joint Entrance Examination (Main)

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