Dear aspirant, I'm sorry to disappoint you but with 273 marks, your chances of getting admission into a government medical college are very slim, under both AIQ and state quota, even with a bc certificate.

To give you a clearer idea,  let me show you some previous years' cut offs (for bc candidates) of medical colleges under state quota.

Rajah Muthiah medical college,  Annamalainagar- 296

Kanyakumari medical college- 331

Govt. Sivagangai medical college- 315

Hope that helps!