This is a personal hobby.
Or work needs
Basic mathematics education in China is ok, so there is no need to go abroad.
But not at the top. In the master's and doctoral stages, you really have to read a lot of foreign original works and documents.
Since you like it, let me recommend two books to you.
First, "Mathematical English"
Author: edited by Wu Jiongqi
Press: Higher Education Press
Publication date: 2006- 12- 1
Words: 360000
Version: 1
Page count: 30 1
Printing time: 2006/ 12/0 1
Industrial and commercial bank number: 9787040 160888
Second, "Mathematical English"
Author: Hao Cuixia Editor
Press: Harbin Institute of Technology Press
Release date: February 2005-1
Word count: 168000
Version: 1
Number of pages: 202 pages
Printing time: June 0, 20061
Industrial and commercial bank number: 978756032 1 189
It's okay. You can have a look.
If you are a student, you should study hard for the college entrance examination.
You can get more than 140 in the college entrance examination.
It's never too late to go to college.
good luck