I think it can be divided into these parts: 1, first introduce your name (on the household registration book), date of birth and so on. If you have won prizes, such as "three good students", "excellent young pioneers", "... competition" and so on.

2, write your understanding of the regiment, the regiment is the party's reserve army. ....

3. Write down your determination to join the league and your willingness to accept the test of the league, keep moving closer to the center of the league, keep learning, be strict with yourself, and strive to join the league as soon as possible.

I just said these briefly. I don't know whether they will help you. Please play more yourself.