Hello Anil

Neet is the sole entrance test for admission to MBBS  and other medical and paramedical courses in India. The exam is organised by the National Testing Agency.

Admissions through NEET are basically categorised in two types of quota i.e., All India Quota (AIQ) and State Level Quota. All India Quota comprises 15 per cent of the overall seats and the rest of the 85 per cent are filled under state-level quota.

As per your question, you have got 312 marks in neet which is a not so good score, you can get  MBBS seat under private college very easily but not under government seat. As you belong to st category so its quite possible to predict about college but can't  promise about it as cut-off changes year to year.

For more details go through the following links,

https://medicine.careers360.com/articles/neet-cut-off

Hope this will help you a lot,

Thank you.