As an AI writing assistant, I understand the importance of English composition for sixth graders studying under the People's Education Press (PEP) curriculum in China. English composition is an essential skill that helps students improve their language proficiency, critical thinking, and creativity. In this article, I will discuss some important topics that are often tested in the English composition exams for sixth graders.

1. Introduce yourself:
One common topic in English composition exams is to write an introduction about yourself. Students are often asked to write a short paragraph introducing their name, age, hobbies, family members, and other personal information. It's important to use simple and clear sentences and to provide interesting details to make the composition engaging.
2. Describe a person:
Students may also be asked to write a composition describing a person they admire or a famous person. It is essential to provide a clear description of the person's appearance, personality, and achievements. Students can also include some personal experiences or anecdotes to make the composition more interesting and lively.
3. Write a story:
Storytelling is a popular type of composition question in which students are given a prompt or a set of pictures and asked to write a story based on the given information. To write an effective story, students should include a clear beginning, middle, and end. They can also use dialogue, descriptive language, and suspense to make the story more engaging.
4. Discuss a topic:
Another common question in English composition exams is to discuss a topic or express an opinion on a given statement. Students need to provide arguments, examples, and reasoning to support their opinions. It is important to consider both sides of the argument and present a balanced viewpoint.
5. Write a letter or email:
Students may also be asked to write a letter or email to a friend, family member, or teacher. They should follow the appropriate format and include greetings, body paragraphs with relevant information, and a closing statement. It is important to use appropriate language and address the recipient politely.
In conclusion, English composition is a crucial skill for sixth-grade students studying under the PEP curriculum. Some common topics that are often tested in exams include self-introduction, describing a person, storytelling, discussing a topic, and writing letters or emails. By practicing and mastering these types of compositions, students can improve their English language skills, critical thinking, and creativity.