Career

Yes, you can by appearing and securing valid score in state entrance examinations or other entrance tests like AIMS,GIPMER etc.You can also get admission under management quota without valid score in entrance. But it is so expensive , and the cost medical education in India will be 35- 50 Lakhs .
Alternatively you can take Medical degree from Chaina, Russia, Europe, Sri Lanka etc. it is more economical , the total fees package will come around 10-15 Lakhs.But you have to pass screening test conducted by medical council of india to get registration in India.
Analyze all the options available and take right choice
All the Best

No there are no chances to get a job directly in other country specially in Australia. There is only chance to get job there if you are selected from your college directly.

You may find out here:- https://engineering.shiksha.com/be-marine-engineering-colleges-in-india-categorypage-2-62-1-0-0-1-1-2--none-1-0

There are so many universities or group. You can find out about their placement, history, salary, past year results and other information. Talk to some expert and then decide.

If u a student of Science.lot of opportunities are for you. medical, engineering, polytechnic, ITI, etc. If u a student of arts or combined .hi can also try for ITI or polytechnic. other wise General study line is open for both stream.

See numbers are just an eligibility criterion, above 60% everything is equal and at the end of the day it all depends on your abilities.Jjust try to improve it in your graduation

Indian IT industry has become very competitive. Supply of computer professionals is higher in comparison to demand. If you want to have a good and meaningful Software Engineer career then you must plan your education upto B.Tech CSE/IT or M.Sc IT or MCA. You may not able to make good Software Engineering career with few certificate courses. I will advice against doing only courses to become Software engineer.