Forget the slow, pedagogical audio. Vaughan 4.0 uses native contractions and elisions. You won't hear "What are you going to do?" You will hear "What'rya gonna do?" If you can transcribe that, you are ready.
If you have clicked on a link for the , congratulations are in order. You have survived the grammar labyrinths, the tense charts, and the awkward "My name is..." introductions.
You are in the "Advanced Purgatory." You understand Friends without subtitles (mostly), but you still freeze when a native speaker uses the word "albeit" or tells a joke about sarcasm.