The difference between economic and financial mathematics and science and engineering mathematics is quite big: science and engineering focus on calculus, discrete mathematics, linear algebra, complex variable functions and so on. These difficulties in economic mathematics cannot be compared with the above (some of them are completely out of touch). As long as you master their basic theories, theorems and formulas, the exercises in the textbook can be completed independently, which will not be a great obstacle to your economic mathematics.

However, economic mathematics requires quite high probability theory and mathematical statistics, and many related softwares are in the field of economics, especially metalworking. Postgraduate entrance examination is a compulsory course, which is more demanding than calculus. I suggest you learn probability theory well. I'd better learn as well as I can while I have spare capacity. The above are only the most basic requirements of metalworking mathematics.