When looking at the topic and the question in the card you will receive 5 minutes beforehand, think about everything you know on the subject and select peculiarities or the most relevant issues that you know you can eloquently develop. Hold on to information and issues you know you are good at, and from there you can adapt to the questions asked as the exam unfolds. Have some good connectors in mind such as "en ce qui concerne... J'ai lu un article qui disait que..." "il faut souligner qu'en fait..."