In this era of competition where people are scoring quite 600+ in the NEET exams it will be impossible to get a government college with 300 marks. Cutoff for general category goes tupto 150 marks.With 300 marks you can qualify the exams but you will get through the private colleges . There fees might be quite high. In this period, due to cut throat competition you will have to score more than 530 or so to get a good government college. 

Given below is a list of Private college which have cutoff marks 200+ for domicile people. You can check in the colleges which are present in your state.

1. Adichunchanagiri Institute of Medical Sciences, Bellur
2. Basaveswara Medical College and Hospital, Chitradurga
3. BGS Global Institute of Medical Sciences, Bangalore
4. Dr BR Ambedkar Medical College, Bangalore
5. JJM Medical College, Davangere
6. K V G Medical College, Sullia
7. Kempegowda Institute of Medical Sciences, Bangalore
8. M S Ramaiah Medical College, Bangalore
9. Navodaya Medical College, Raichur
10. Rajarajeswari Medical College & Hospital, Bangalore
11. Sapthagiri Institute of Medical Sciences & Research, Bangalore
12. Srinivas Institute of Medical Research Centre, Srinivasnagar
13. Vydehi Institute Of Medical Sciences & Research Centre, Bangalore
14. SDM Medical College, Dharwad
15. Father Mullers Institue of Medical Education and Research, Mangalore
16. Johns Medical College, Bangalore
17. East Point Medical College, Bangalore
18. Akash Institute of Medical Sciences & Research Centre, Bangalore
19. Kanachur Institute of Medical Sciences, Mangalore
20. Mahadevappa Rampure Medical College, Gulbarga
21. Nijalingappa Medical College & HSK Hospital & Research Centre, Bagalkot
22. S S Institute of Medical Sciences& Research Centre, Davangere
23. Shridevi Institute of Medical Sciences & Research Hospital, Tumkur
24. Al-Ameen Medical College, Bijapur
25. Khaja Banda Nawaz Institute of Medical Sciences, Gulbarga
26. Subbaiah Institute of Medical Sciences, Shimoga
27. The Oxford Medical College, Hospital & Research Centre,
28. A J Institute of Medical Sciences & Research Centre, Mangalore
29. MVJ Medical College and Research Hospital, Bangalore
30. Sambhram Institute of Medical Sciences & Research, Kolar

All the best. Aim to improve a little bit more and you will definitely be achieving much more score.