Yes with your ST category you may secure a seat in some of the Karnataka govt. Medical colleges with 300 marks.In this score your All India rank will vary around 1,50,000.

MBBS Colleges you may get are-

• Chamarajanagar Institute of Medical Sciences. 
• Kodagu Institute of Medical Sciences. 
• Gulbarga Institute of Medical Sciences. 
• Karnataka Institute of Medical Sciences. 

Chances are low but you can try getting into these colleges. 

Thank you. 

Hey Arvind,

It would be difficult to tell you your exact chances as cutoffs vary from year to year depending on various factors like no. of candidates appearing for the exam, no. of seats available, difficulty of the exam and the top NEET scores. However, based on previous year cutoffs, colleges you can expect are: