Dear teacher x:
Hello!
My name is XX, and I am an undergraduate majoring in XXX in XXX University. I hope to have the opportunity to study for your master's degree in 2020, so I take the liberty to write to you.
My first test score was XX. According to previous years, I can enter your college for a second interview. During my undergraduate course, I got excellent grades. In the past three years, my grades have been ranked first in my class and among the best in the whole department (if I am excellent, I can rank better).
I study hard and practice actively. Under the influence of the teacher's careful training and the good academic atmosphere in the university, I have accumulated some experience in basic knowledge, design experiment and operation ability, which has laid a solid foundation for graduate study. Attached is my resume and my academic achievements in the past three years. Please take a few more minutes to have a look. I looked up your relevant information on the Internet and read some articles you published. I am very interested in the subject you are studying, so I really hope to study for a master's degree in your research group. I believe that through my own efforts, I can complete the master's task well.
I take the liberty of writing to you, please tell the truth! Thank you very much for taking time out of your busy schedule to read this letter! Good health! Have fun at work!