The searches were carried out in different places of Madhya Pradesh.
CBI sources said the search was conducted based on inputs from a team probing the case. The searches were related to cases pertaining to the Transport Constable Recruitment Examination, 2012 and the Pre-Medical Test, 2012.
The sources said all these supervisors, now retired, had played a role in tampering OMR answer sheets of some candidates to ensure they cleared the examinations.
Documents recovered during the searches were being scrutinised, they said.
There had been massive irregularities in recruitment examinations conducted by the Madhya Pradesh Professional Examination Board or Vyapam and CBI has been entrusted to probe the matter.