Hello Sushil, 

As per your score in NEET UG 2018, you have good chances for admission in St. John's Medical College, Bangalore. As this institute is a private institute so its clossing cut off score was 300, so your score is above the cut off score.

Please fill the counseling form, and appear for the counseling and if you clear it. You will get a seat. 

For better understanding, use CAREERS360 NEET UG COLLGE PREDICTOR, it will help you knowing what all colleges you have chances for admission.

Hope this helps, thank you

All the best