https://patrikai.com/candidate-should-use-black-ball-point-pen-only-in-tnpsc-group-1-exam%e0%ae%95%e0%af%81%e0%ae%b0%e0%af%82%e0%ae%aa%e0%af%8d-1-%e0%ae%a4%e0%af%87%e0%ae%be%e0%af%8d%e0%ae%b5%e0%af%88-%e0%ae%95%e0%ae%b0/