I don't see how we are suppose to do those without a calculator, unless it requires a formula only.
They haven't been any in the past papers I'm doing.
Personally I'd do the comprehension questions first because they usually take the quickest and then you have an idea of how much time you have left. Then you should do the essay as you need the most time for this and should write to the question and not the time limit. Leave your creative story...