Chhattisgarh authorities on Sunday cancelled the scheduled Pre-Medical Test (PMT) for admissions to medical colleges as the question paper was found to have been leaked.
Police have arrested 12 youths in connection with the leak, which came to light last night.
The new dates would be announced soon, the exam authorities said on Sunday.
The arrested persons include some students of dental and medical colleges.
Additional SP, Raipur, Lal Umed Singh said that acting on a tip-off police raided a house in Takhatpur village in Bilaspur district and found that some 80 PMT aspirants were being tutored on the basis of the leaked paper.
Police suspects that one Santosh alias Sanjay is the kingpin of the inter-state racket, which leaked the paper.
The PMT had been earlier scheduled for May 11 but it was deferred because some questions already asked in the Uttar Pradesh Pre-Medical Test had been mistakenly incorporated in the paper. Some 20,000 students have registered for the exam.