Kalai Nanmani R Rajkumar has accumulated five years of experience in teaching for the Tamil Nadu Public Service Commission (TNPSC) examinations, along with three years of experience in coaching candidates for the Tamil Nadu Uniformed Services Recruitment Board (TNUSRB) exams. His extensive personal experience in the examination process includes qualifying for and appearing in the TNPSC Group 1 Mains examination three times, the TNPSC Group 2/2A Mains examination once, and successfully reaching the interview stage for the TNPSC Group 1 examination on one occasion.