The student, a native of Muzzafarpur in Bihar, was arrested on charges of cheating, criminal conspiracy and different sections of the IT Act, said Surinder Kumar, the deputy superintendent of police, Kangra.
The director of NIFT had reported to the police that someone hacked the official website of the institute and uploaded the result.
The college administration also found that several mark- sheets had been tampered with, Superintendent of Police, Dharamsala, S Gandhi said.
During probe it was found that the accused, a student of fashion designing semester VIII, hacked the NIFT's official website and increased marks in his own mark-sheet and also of other students, the SP said.
"This (the changes) were also found in his laptop history," Gandhi added.