Hey.

Here is a list of all government medical colleges in Tamil nadu and their cut off ranks and marks respectively  for the general category under the state quota. Considering if you score around 400 you seem to have a fair chance in a few of them 

ESI-PGIMSR, ESI Hospital, KK Nagar, Chennai

1,115

374

Kanyakumari Medical College, Kanyakumari

931

390

Coimbatore Medical College, Coimbatore

566

428

Govt. Dharmapuri Medical College, Dharmapuri

951

388

Vellore Medical College, Vellore

949

389

Thoothukudi Medical College, Thoothukudi

939

389

Mohan Kumaramangalam Medical College, Salem

906

392

K.A.P. Viswanatham Govt. Medical College, Trichy

892

394

Tirunelveli Medical College, Tirunelveli

886

394

Thanjavur Medical College, Thanjavur

774

404

Stanley Medical College, Chennai

333

469

Madurai Medical College, Madurai

423

Kilpauk Medical College, Chennai

435

Madras Medical College, Chennai

524

Chengalpattu Medical College, Chengalpattu

684

413

Govt. Medical College & Esic Hospital , Coimbatore

984

385

Govt. Medial College Omandurar Estate Chennai

759

405

Govt. Villupuram Medical College, Villupuram

956

388