Texas A&M is a great school for math so it's pretty competitive. What is your current university? I think your transfer will be a little difficult. You should try to raise your TOEFL to maybe 90+. It's also important to write a really strong personal statement and make sure you have good reasons for why you want to transfer. You need to demonstrate that you know details about the university and the math program.
If you need help with your transfer, add me on WeChat: DanCWU