What happened
Fraud combined impersonation by paid solvers with answer-key/OMR manipulation; STF found 286 candidates cleared by dishonest means and 27 MGM Medical College (Indore) students were later expelled. Exam held first week of June 2012; day approximate, 1st used.
What was done
Source
Primary reference Wikipedia ↗ https://en.wikipedia.org/wiki/Vyapam_scamThis entry summarises the linked report. Where the summary and the source disagree, the source wins — and please tell us.