Every school is different, such as probability theory, basic mathematics, mathematical calculation, probability theory and mathematical statistics, applied mathematics and so on. If you want to find a good job, consider financial mathematics!

If you don't want to apply for graduate students majoring in mathematics, you can apply for graduate students majoring in economics or management. Because math is better, they will have an advantage over undergraduates majoring in economics or management. Many people who have switched from mathematics to economics and management have become the best in that field.

Of course, mathematics majors can also apply for engineering graduate students, but if there is still a gap between the courses of related majors and the graduates of this major, they need to make up classes seriously.

I hope I can help you.