Preparing for a speaking assessment
When you talk to your teacher, you can't predict exactly what he/she will say. Listen carefully at all times and respond to his/her comments. Don’t be afraid to ask for a repetition or explanation of what your teacher is saying (but in French, of course!) Pardon, je n’ai pas compris! or Voulez-vous répéter, s’il vous plaît! will work wonders.
Be flexible! For a paired dialogue, do lots of different practice situations within the classroom, and make sure you practise using vous instead of tu! Before a solo talk, try to record yourself. It's embarrassing to listen to, but it's a good way to improve! Most importantly, rehearse your speech until you feel confident. Practise in front of your friends, family or even a mirror if necessary!