Justice P Bhavadasan also enhanced the fine amount awarded by session court, Kottayam and directed the lecturers of NSS College, Pandalam, to pay Rs six lakh to the victim.
The prosecution case was that the accused gang-raped the victim, a third year student of the college, during in 1997.
The accused were punished for a term differing from 11 years to seven years and fine aggregating to Rupees six lakhs.
One of the accused who was also a lecturer of college, expired after trial.