Ilaa,
These courses IBM, GBM are specifically made for international students whose profile does not match any other 'technically oriented' program. However, some students choose this course because the studies are so easy that it gives them sufficient time to pursue part time work, night shift factory work, etc.
I do not know your country or educational background but I have some idea of IBM program at Seneca college, I assume Centennial must be the same. It is just a bunch of useless subjects grouped together to create a money-making program. Some international trade, inter-cultural communication, very basic managerial accounting and some excel, etc.
Almost 100% of the class will be non-Canadian students, mostly students from India (Gujarat, Punjab), a handful of Chinese (who did not succeed in their University entrance exams back in China), etc. There will be a lot of group-work on assignments. Very few people fail. The only new thing you will learn is the anti-plagiarism policy, i.e. do not copy and paste from some place because it will show up in Turnitin.
The GBM is longer in duration and includes more subjects, I have no idea how good it is. I only know about Toronto colleges.
But IBM at least will not fetch you any job, it will just be a way to reach Canada and see the beautiful, clean landscape if you haven't visited there earlier.
Think about it, if you are in your twenties with no significant management experience, how can a 8 month certificate make you 'International Business manager'?
2 year GBM or MBA might be a bit better, gives you more time to understand Canada, Canadian workplace requirements, etc. Also if your previous background is in IT, engineering, it will be easier to get a job.
