Hello there.

To get into St. Johns Medical college you will have to crack the NEET examinations. There is no other way of getting into this college or any medical institute whatsoever. After cracking the examination, counseling rounds would take place for allotment of seats to meritorious candidates. 

To prepare for NEET examination mentioned above the following books could be helpful.

Biology : NCERT, MTG NCERT at your fingertips

Chemistry: NCERT, NCERT exemplar, Vibrant Academy's Physical Chemistry by N Awasthy, Arihant Organic Chemistry by MS Chouhan

Physics: NCERT, NCERT exemplar, HC Verma, Arihant's Objective Physics by DC Pandey.

For more relevant information kindly check the following link:

https://www.careers360.com/colleges/st-johns-medical-college-bangalore

Hope this helps.

All the best.