Going through ETS material

Hey everyone, so I heard that it is a good exercise to find the fastest way to answer each question of ETS material. So my question is how are we supposed to do this? Like first going through the exercises and solving them under timed conditions using our best approach and then going back to the question and analyze it until we found a fastests route? Has anyone done this? I would appreciate if you could share any experiences you have had.

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