Recurring dream

In the dream I am in an exam I haven't prepared for. The usual thing, old anxieties standing in for new. I'm wise to it now, even asleep. At some point, I remember that my schooldays are over, and I fold the paper into an aeroplane, or pull the fire alarm, or just wake up. This time I take the third option. I wake in a cheap plastic chair at a square little table. I have dribbled on the exam paper a little. There are ten minutes left.