Oral
Probably too late now but we had weekly sessions with our teachers where we just talked at each other... there were only 3 people doing German at my school so it wasn't exactly hard for them to schedule though...
Memorise a few impressive-sounding sentences and nonchalantly throw them in somewhere, preferably with complex grammar like the subjunctive (or whatever).
Memorise the opening few sentences of your answer to the first question (generally something predictable like "tell me about your family"). You'll feel more confident if you can lead off fluently at least.
Learn a few of the typical "umming" words and phrases in the language, like "well...", "my opinion is..."
If you must umm and err, at least use your LOTE's equivalent and not the English (e.g. in German they tend to use "also..."... obv pronounced differently)
Also prepare a "delay phrase" - i.e. "hmm that is an interesting question, may I have a moment to think about it?" I had two teachers who were examiners and they both told me they would prefer it if you said that, took 10 seconds to think and came up with a decent answer to a question rather than ramble on about nothing.
HAVE CONVERSATIONS WITH YOURSELF IN THE SHOWER. Seriously. Especially if you're learning new vocab, use the new words as much as possible, preferably in ridiculous ways, cos that's how you'll remember it