Canada

Universities abroad don't look at only your academic scores. They look at your overall profile. So if you have a good subject understanding, and have a well-rounded profile you shouldn't have any issues with admission.

It is mandatory for embassy attestation. Apply immeditely for duplicate certificate in prescribed application form and pay the fees prescribed in the form of Challan /DD.
You need advertise in news papers the content how you lost it, with register number and also want to get principals signature.
After completing these, approach a Notary and prepare an affidavit. These are the procedures.

Yes you can. here is the link to best universities and their requirement. you may choose the co- op route or the direct one and apply.
http://www.canadianbusiness.com/lists-and-rankings/best-mba-programs/2016-reputation-ranking/
All the best

Dear Rajan,
There is no official ranking system followed by Canadian universities. Among the top most you have McGill, University of Toronto, University of British Columbia, University of Waterloo and Queens University.

Hi,
It would be difficult to get admission with this percentage but if you have good IELTS/TOEFL score, it might help you.

Dear Mani, aim for an upper first class which can be above 70%. Canadian universities are quite selective.

Dear Amritpal, how about a Bachelor of business administration or business management, you can also consider Bachelor of commerce at the first place but must cope with economics classes. Another good choice could be CA,CPA, CIMA,CMA etc. You can plan for a Masters in finance in future. Please remember that for a successful career in finance you must have a knack for economics and its ups and downs.
Best Wishes