1. Learn the basics: Mathematical modeling competition needs some knowledge of mathematics and computers, so freshmen should first lay a good foundation, including advanced mathematics, linear algebra, probability theory and mathematical statistics, discrete mathematics, etc.

2. Learning programming languages: Mathematical modeling competitions usually need to write programs to solve problems, so freshmen should learn at least one programming language, such as C++ and Python.

3. Participate in training courses: Many schools and institutions will provide training courses for mathematical modeling competitions, and freshmen can participate in these courses to improve their abilities.

4. Practice problem-solving ability: The topics of mathematical modeling contests are usually complicated, and freshmen can improve their problem-solving ability by doing contest topics over the years.

5. Form a team: Mathematical modeling competitions usually require teamwork. Freshmen can find some like-minded students to prepare for the competition.

6. Participate in the simulation competition: By participating in the simulation competition, freshmen can be familiar with the process and rules of the competition and improve their competition experience.

7. Read related books: Freshmen can read some books about mathematical modeling and understand the basic theories and methods of mathematical modeling.