Hey

yeah. you can get a bsc cardiovascular technology course easily. you have good 12th score.

to join a government hospital, you can apply to the state interview which is conducted every year. you havent said your home state, so i cant tell the name of the interview. but there is an interview that you can attend. and based on  that you will be given job in government hospitals.

or if you study in govt college, you can work in same college's hospital based on your performance during practicing