For the financial major you want to apply for, I suggest you go to the Netherlands. Finance is a traditional advantage major in the Netherlands, and it is taught in English. As for schools, you can visit Ada and tilburg. Because I don't know which colleges your school is, it's really hard to recommend it blindly.
It should be noted that both Northern Europe and the Netherlands require applicants to have relevant professional background. Your undergraduate major is mathematics, and you may lack some courses in finance, so you may have problems when applying. I suggest you take your report card to Kai Tak Education for further detailed consultation.
In addition, you can also look at the French Higher Business School. Higher business schools in France have a relatively high position in the world business school system, and the graduates of excellent higher business schools have a very good reputation.
For finance majors, if you are pursuing colleges and universities, then IELTS scores are definitely insufficient. It is recommended to score above 6.5, the Netherlands will require more than 6, and there is gmat.
I hope I can help you. Specifically, you can go to the local Kai Tak Education and professional consultants for face-to-face consultation.