Uma Shankar Gupta (42) was arrested from his Jasola Vihar residence in Delhi, they said, adding that it is the sixth arrest in the case so far.
"Gupta, a habitual offender, had earlier duped several people in the name of providing question paper of the medical entrance examination. He is based in Delhi and had established links in other states to operate his gang.
Gupta owns a firm in Lajpat Nagar in Delhi, through which he allegedly ran the gang that leaked question papers of the medical examination paper and help people grab a seat in medical colleges across the country.
"His role in impersonation racket is being investigated," Mishra said.
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On May 8, police had arrested five members of the gang, including a government employee, in the case.
The accused had promised ten students, taking the exam, to provide leaked question papers to them in lieu of money and they were about to take Rs 5 lakh from each students.
One of the ATS team was in Delhi and arrested Ashok Gupta and Rahul while the team in Jaipur detained Vikram Sinha, Vikas Sinha and Bhupendra Sharma.
Sinha's had offices in Rajasthan and Bihar to lure the candidates, while Ashok Gupta is a close friend and a partner of kingpin of the racketm, Uma Shankar.
All the five were placed under arrest for cheating under IPC sections including 420 (cheating), 468 (Forgery for purpose of cheating) among others.