First of all, it's not difficult to draw a short reading.
Then choose a topic and start a dialogue. You have five minutes to prepare before, and you and your partner can discuss how to start the conversation. Speak for 5 minutes, and then the teacher will ask some questions about your conversation.
Topics are generally about campus, college students, CET-4 and CET-6 composition topics and other common topics.
Don't worry, as long as you don't make the teacher unable to recognize that you are speaking English, there will be no problem. I haven't heard of anyone speaking English.