I think the dream is about the feeling rather than the specific situation, your brain takes a feeling and translates it into images that are familiar and don’t necessarily mean anything in themselves. Personally I was fairly good at meeting deadlines or churning essays out in a few hours depending on how you look at it, and even I realised that my dissertation was too long to be able to do it in the last week so I was more organised.
To me the theme of these types of dreams is ‘fear of not being prepared’. I am confident of dealing with situations I feel prepared for but don’t like being thrown in at the deep end. In that sense this dream and the ‘oh fuck I’m suddenly in Mogwai’ one above are basically the same.
In the dreams (and in real life), there’s a period of worry but things generally turn out okay, like nobody realises I can’t actually play guitar, or I suddenly discover that actually I can.