BCA

Yes, you have to give an entrance test for admission in masters in English and should score minimum 60% in your graduation.

For BCA course, the best choices would be Tilak Maharashtra Vidyapeeth (TMV), CSIT, Symbiosis and College of Computer Sciences.

Yes, you can do BCA after 12th commerce but you have to face some problem in mathematics because in BCA, mathematics is a compulsory subject.
But in some colleges, you don't need to study mathematics.
And it is my understanding that it is good for you to select a good college for BCA, otherwise, it will ruin your future.
Best of luck.
God bless you.

Hi Priyanka,
Yes, candidate who have passed with at least 55% marks in aggregate in Bachelor's degree in Engineering/ Technology and specialization in Science and Mathematics with 55% marks or equivalent qualification are eligible to apply for B.Ed. But, you have done BCA, then MCA is best for your career.

Hi Prashant,
A well-known fact when applying to Canada is that a three year degree course from India is not accepted. But, for a PG Diploma programme it can be accepted. So, I will ask you to quickly email some universities and colleges and find out. Your percentage is also low so you will have double the competition for admission. Courses like networking, computer Science etc. Are competitive and quantitative so universities ask for higher percentage. You can visit the websites and get a clarification. You can also look a couple of universities in Australia.

There are over 27 forensic science colleges in India. Please refer to the link provided below for a detailed list of colleges which offer forensic science courses from India. You should be able to navigate to a college of your choice using the filters on the web page. Additionally, you can also download their brochure for further details.
Regards.
https://www.shiksha.com/science/colleges/forensic-science-colleges-india

Fee structure varies from institute to institute and also depends whether the college is private or government
Check out the list below for top BCA colleges and there fee structure:
https://www.shiksha.com/it-software/ranking/top-bca-colleges-in-india/96-2-0-0-0.

Follow the official link below for details:
http://presidencycollege.ac.in/admissions/application-form/
http://presidencycollege.ac.in/wp-content/uploads/2016/04/UG_Courses.pdf