A system and method for conducting a computer based candidate assessment in an examination center has been described. The system primarily involves a candidate assessment device in communication with the computer. The candidate assessment device further comprises an operating system and an assessment application. The candidate assessment device captures the proctoring data of the candidate during assessment. The system also includes plurality of sensors including camera and biometric sensor. The biometric data captured from biometric sensor is used to authenticate the identity of the candidate using the UIDAI database. The system also includes an external communication device to sniff a plurality of external communication within vicinity of the candidate. Further, the proctoring data is provided to an assessment server. And assessment server raise an alarm if one of a predefined suspicious activity is detected.