MBA Eligibility

Minimum eligibility for application to the ITM PGDM programs is a Bachelors Degree from any AIU recognized University with minimum 50% marks aggregate.
Final year students may also apply.
In addition, candidates must have appeared for one of the following MBA Entrance Tests: CAT, XAT, MAT, CMAT, ATMA, GMAT & State CET tests where applicable, and as per AICTE guidelines.

MBA after BBA is logical extension of management education. With BBA you can only get supervisory or lower managerial roles with salary of around Rs 20000 only. MBA from Tier I and II colleges will give push to your career and set foundation for long term high paying, high status job. MBA will entail further education for two years and loss of salary which you can earn after BBA. I am of the opinion that if there are no personal reasons, you must complete your education by doing MBA before starting your career.

You are not eligible for MBA entrance examinations in renowned B-Schools if you are a general category student. Reserved candidates with 45% marks are eligible to appear in MBA entrance exams.

If you are writing entrance exam for engineering colleges, then 12th class subjects will matter. If you are writing exams for MBA entrance exams, then class 12th science subjects will not matter.

It is a prestigious university in Canada. I am sorry to say that you are not eligible for the same.
For more details check out the website:
http://www.ryerson.ca/mba/admissions/

Ideally you are not eligible. You need a minimum of 50%. But I would suggest you to apply, if you would like to give it a try. Who knows they might give you an opportunity if there are not enough applicants.

yes you are eligible

Yes your graduation score does play a role in your selection in a good MBA college. They look at your 10th, 12th and graduation scores. However the criteria is different for different colleges.
All the best.