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Oh yeah, always give the whole thing a read through first, finish early and change a few if other stuff comes up, and mostly they'll be marking non multiple choice stuff on certain points if it's English or something, so answer from a few points of view and you'll get something right and it'll all add up. Multiple choice is ignore the stupid one, ignore the less stupid one, pick between the other two based on knowledge, guesswork, other questions or weather.
A classic slacker technique is just reading through to see if any later questions have answers/hints for the earlier ones.