Masters

You need to complete UG in order to pursue PG Diploma.

71.2% is a good score for Canadian universities. You have good IELTS scores too. So, this can help the officials overlook your 12th percentage. Do not forget to mention in your SOP for 12th marks and how you worked hard in your Bachelor's degree to get the scores. It would be great if you tell me whether your Bachelor's course was for 3 years or 4 years. If it's of 3 years, then you can for Diploma or graduate certificate course from a Canadian college, if it's 4 years course, you can apply for Canadian universities for Master's degree programme.

Hi Akash,
First login into 'daad.org' and know about the universities and their requirements. You can apply through 'university assist.in'. After applying to the universities you, when you fulfill their requirements you will get an admission letter. Requirements like ILETS, language and score at your graduation level.

Hi,
You can appear for CAT (entrance for MBA). MBA in banking and finance is a good career option that you can pursue.

Yes, it is valid for all the PG courses so please go for higher studies.

If you really want to do Diploma after B.Com then PGDM in international management will be great as it will give you a number of opportunities but try doing it from a very reputed company.

First and most important tip for any exam in India, practice previous year question paper. I am providing you link to buy the book:
https://www.amazon.in/Guide-NIFT-NID-IIFT-2019/dp/9313164418/ref=dp_ob_title_bk
Questions in NIFT are often repeated especially in GAT and CAT part.

Yes, it doesn't matter, either you are graduate with B.Tech or B.Com or BA only. If you are interested then you can take admission in PG course of mass communication in any Indian university. But before applying you have to check the eligibility criteria of universities for the same wherever you apply.