<p>^That’s an excellent list. Every one of those items corresponds with silly errors I have seen many times over the years. </p>
<p>I’m guessing most people won’t bother with the redrawing idea. But it is worth trying, especially on a problem with a diagram that is not to scale. A neat re-draw often triggers the flash of insight that the non-scale diagram was deliberately obscuring.</p>
<p>The only one I’m not on board with is the calculator. That one really depends on the individual student. But it’s true for the top scorers.</p>