What are my chances of admission with my backlogs and profile for the three universities I am considering in UK/Canada?

It depends on the country and university. With 13 cleared backlogs and a 7.8 CGPA, your chances are:

- USA: Most universities accept up to 5 - 8 backlogs. With 13, options are limited, but some less competitive institutions may consider your profile if all backlogs are cleared and you have a strong Statement of Purpose and relevant achievements.
- Canada: Typically, up to 5 backlogs are accepted. With 13, chances are very limited, even at flexible institutions.
- UK: UK universities are generally more flexible, often accepting up to 10 - 15 cleared backlogs. You have a better chance here, especially if you explain your academic history and highlight relevant experience.

Focus on clearing all backlogs, preparing a strong application, and targeting universities known for flexibility - especially in the UK.