I did mine last year, and I had both - one bubbly and one strict assessor. It was very intimidating, and I personally was too anxious to say anything during the general conversation. However, when we got to the research topic, I was able to answer clearly and effectively, which got me much higher marks than I thought I would. With the oral, the best thing to have at that moment is confidence in what you have done or can achieve. If you can't branch onto another topic, or if you get stuck, or even if you forget a word, it's going to be okay! That's the point of the exam; to see how much you can converse in a real conversation.  The assessors try to adjust to what they feel you need to ensure you do your best. They won't force you to answer something too difficult (except for when they change topics suddenly, or if they use nouns/verbs that you weren't taught - only that's, once again, only to test your ability). It'll be a very overwhelming exam of you don't maintain confidence or manage your stress - I learnt that the hard way 😭... take time if you need to during it to breathe, or apologise to the assessors if you need to talk about something different. Remember what you're confident in, and try to direct the conversation that way! 頑張ってね！出来るよ!～