To answer the original question briefly:
Given that there's only 2 days left, there's at most 4 past papers that you can realistically do (i.e. 2 a day), and optimistically at most 6. That's assuming that you temporarily have enough time to focus studying on MX2. So out of the remaining past papers, think about which ones you would want to do. Any paper from 2001 onwards is viable, but as a rule of thumb they get increasingly harder the further back you go.
Ensure that you're set on all of the comparatively basic stuff (e.g. usual integration by parts) and have a firm idea of where your silly mistakes are, so that you know what to watch out for when checking your responses during the exam. Also remind yourself to frequently look at the clock.
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This is, of course, a point where the curve 'flattens out' and the tangent to the curve becomes horizontal. As opposed to the next case.
And thus as \(x\to 0^+\), the curve slops further and further upwards.