Canada

Yes, you can. However, based on your syllabus only the course director can take this decision after seeing the papers you have covered in your engineering Diploma. If you have done this Diploma after 12th, you will be considered easily. If you have done 10th and then Diploma, it will be difficult to confirm this.

Which institute are you asking about? And, I think you should get in touch with the institute directly, check websites or email them for annual fee details.

I would suggest you to go for a degree course. A degree course always has a upper hand as compared to Diploma.

Hi,
The university might give you provisional admission, but you need to clear all backlogs before getting admission.

All courses abroad or specialized one. You can do PG Diploma or PG in:
Construction management
Structural engineering
Geo technical engineering
Go through few university website and see the course options.

Have you applied for any colleges?

It depends on which University you apply and your GRE score. Since you have even work experience, there are high chances of getting MS in CS if you perform well.

I hope this link will help you
https://www.bakersjournal.com/education/baking-training-schools-in-canada-6863.

Everything depends on the potentiality of yours and your ability. By the degree of BBA (IB), surely it can land you in a good corporate world. And, you can able to excel and enhance a lot. Thus, I would simply say 'yes'. You can get a job in a good company.
Everything depends on the Interview, and your knowledge skills.