The OMR sheets are included in the offline forms only so you can apply in Offline mode. Tamil Nadu MBBS 2018 offline application forms are available from June 11 to June 18, 2018 from 10.00 am to 5.00 pm at all government and dental colleges. You can check the further information with the given below link.

https://medicine.careers360.com/articles/tamil-nadu-mbbs-application-form

Good Luck!