For your question, first of all, most people need a higher foundation of mathematics to learn a certain degree from computers.
Similarly, as long as you study computer, you must have good logical thinking ability, which is very important. For example, when you are looking for a job in your senior year of computer science, most software companies study basic computer knowledge+logic topics+language.
Their proportion varies from company to company. The general written test topic is about 70 +30 logic. If you are a math major, you must have some advantages in logic.
Secondly, the computer just started to work, and basically won't use what I learned in college for four years. What is very important in your work is your self-study ability and logical thinking ability. Most languages are gradually learned in the company through your own abilities and according to what you use. As for getting started, I don't think it's difficult, because I didn't learn much before I started 4, but I studied JAVA for half a year and found a job by JAVA. As for the future development, as long as we can enter the company, everyone will basically be in it.
Finally, rely on computer knowledge to find a job, because your major is different, it may be difficult to get recognition from the company, and the entry threshold is relatively low.
Personally, if you strongly change careers, you should either take the postgraduate entrance examination or use the rest of college students' time to take some computer certification tests.
Besides, I don't know how your language is. On the premise of good English, knowing some small languages, such as Japanese, is very popular in software companies.
As for the computer major of graduate students, it is generally computer professional knowledge+English+advanced mathematics+politics, just like others.
There is nothing to say about the last three aspects, especially mathematics. Personally, I think it is really not difficult for computer professional knowledge. What matters is the data structure, which some schools know.
And it is closely related to mathematics, so believe in yourself and come on.
Many computer majors take the postgraduate entrance examination from scratch, or from a little impression.
Good luck!