It seems as if everyone did section 3 first, spent too much time on that, then went onto section 1 and had roughly 15-20mins to do section 2. The hard thing will be not to spend too much time on any essay tomorrow.
I think the reason why they don't give you a 5min and a 1 min warning is 'coz they see it as a disturbance, and plus, they think we should be aware of the time.