They included a Delhi Police sub-inspector.
The court also extended till same day the judicial custody of nine other accused, including candidates who were to appear in the Tier-II examination scheduled for September 29, and an Income Tax inspector from Mumbai.
Special CBI Judge Pradeep Chaddah remanded Mukesh Mann, an employee of ESIC, Parveen Mann, a Sub-Inspector of Delhi Police and Vikram Singh Mann, in judicial custody after CBI completed their interrogation.
The candidates in judicial custody include Jaibir, 25, Somveer Malik, 24, Vikas Lakra, 26, Divas, 20, Rohit Khatri, 26 and two women candidates Preeti, 20 and Ashu Rani, 25.
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All the accused have been booked under IPC for cheating, conspiracy and under Prevention of Corruption Act.
CBI had alleged Mukesh, Manoj, Rajnish, Surendra (absconding), Praveen and many others hatched a conspiracy to leak question papers of Combined Graduate Level Examination (Tier-II) which was conducted on September 29, get them solved by experts and provide the same to candidates at the exam centre through electronic means in return for money.
CBI had alleged Vikram, Mukesh, Rajneesh, Manoj and Parveen are masterminds.
They had charged Rs 5 lakh from each candidate.