CBSE 12th

I am referring an answer already given to a similar type of question. Checkout this answer on shiksha:
https://ask.shiksha.com/bca-is-best-or-bsc-in-mathematics-and-what-is-career-in-bsc-mathematics-qna-4070336?referenceEntityId=4070358

Hi Nimiee,
Commerce is a vast field. There are plenty of options you can choose from, you have to know your areas of likes and dislikes and choose accordingly. Some popular choices are:
B.Com
B.A/B.Sc Economics
BBA
CA
CS
CMA
BA/LLB
B.Sc Statistics and so on.

Hi Akshay,
Please mention your stream (science, arts or commerce) and your areas of interests to help our experts guide you better.

Hi Aniket, This is a decision you must take on the basis of your interests. There could be many options after PCB such as nursing, environmental science, agriculture, nutrition and dietetics, food technology, pharmacy, audiology and much more. Research on these subjects, nobody can tell you which is best for you since it varies from person to person. All these programs have good scope in Canada. You must know your areas of strengths so that you excel in your class and enhance your career prospects too.

You should write NDA/NA examination which will be held twice a year (April & September). To qualify in NDA examination, you should work hard in English Grammar (I would suggest you to read 'NDA Pathfinder') and in maths. Also, you should be well aware of the general knowledge related to our own country and should fix your timespan of answering a question.
Following these will be enough to crack this exam.

The cut-off of the colleges vary every year, however, you need to be prepared for very high cut-off.The cut-off for DU last year was 82% (minimum).

Go for BBA or B.Com and then MBA, both are the best combination.

You can pursue any graduation course, but as per my knowledge, you cannot apply for government exams because of the age limit.

Firstly, I would like to say no, if you don't get any good Tier-1 or Tier-2 college because if you complete your engineering from any local college then you won't get a good job. In a case like this, you should opt for some other course.