Questions are in the form of yes/no questions, but they are not. You always need to expand by giving details, justifications, and examples.

  Prepare several stories that can be fitted into different questions.

  Try to give examples from things you are familiar with and easy for you to talk about in English

  The speaking section is not a test of your general knowledge; rather, it is a test of your English. That is why do not care about getting the right ideas because this might affect your fluency.