Hiii Saishruti,

578 is a really good score. If you are planning for admission in st. John's medical college through all India qouta then 578 won't fetch you sjmc in unreserved category. The last year's closing rank of sjmc in unreserved category through AIQ was 3448 which is equivalent around 585 marks. But if you have the state domicile of Karnataka, then you can get sjmc.

I hope this answer will help.

All the best for the future!!