In the first year, you can choose to be a tutor, because you are already a graduate student, so from the academic point of view, it is still very popular, and the market is very big. Moreover, now the tutor is paid by the hour, and the income is very considerable. You can also do oral translation. Postgraduates' English level is generally not too bad. You might as well try this job. Similarly, you also do some literary work such as writing manuscripts, because there are many submission platforms now, and the manuscript fee is quite high. In addition, you can also increase your knowledge and skills reserve. Why not?
In the second year, you can practice in an enterprise, find some jobs corresponding to your major in winter and summer vacations, and earn money with your professional knowledge. This will not only solve your own life problems, but also lay a good foundation for your future work career. You can also do some scientific research yourself. You can apply for a patent if you succeed, and the patent fee is very expensive. Moreover, once you have your own scientific research patent during school, it will be very beneficial to find a job in the future.
Generally speaking, in the third year, time is tight, because I have to be busy with internship, thesis and graduation. There may not be much time for you to earn extra money, so in the third year, you can finish your work well.
Finally, I suggest that you never fall behind in your studies while making money, because students should focus on their studies after all, and if they are among the best, they will get scholarships. You should also learn to manage your money, or you will end up with nothing even if you earn more.