Hello aspirant,

Chances are less of getting a seat in a government college through All India Quota with a score of 342. But you do have chances of getting a seat in your state i.e., through state quota as you belong to the ST category. But I cannot tell exactly which colleges as you have not mentioned your state. From All India Quota you may get a seat in the private colleges, But you can try for government colleges. 

Checck out the link to predict the colleges.

https://medicine.careers360.com/neet-college-predictor

Thank you.