Singapore, New Zealand, Chile, Canada, etc..
Australia is a better choice than EU 
Able to continue my study in a different country. Couple of months left to decide. What would be best in the long run? Undergrad applied mathematics.
Canada would in theory allow you to more readily integrate with work opportunities in Canada or USA. Australia would in theory allow you to more readily participate in the boom coming in Asia from 2020 onward. I would think both have good universities. Australia is less cold. Consider cultural differences, even within different cities in the same country.
You might also consider Singapore if you want deeper integration into Chinese Asia and also multiculturalism where harsh discipline keeps its travails muted.
Also I would prioritize not going deep in debt while in school, thus an affordable education and/or some side job to supplement income.