I would always try to work through a complete set of 40 problems in one 80-minute session, just to build up my stamina and focus. I didn’t mix up problem types – I simply did 40 DS, or 40 PS, or 40 SC etc. After answering a complete set, I used the “Correct” and “Wrong” columns to score myself. Unfortunately OG doesn’t contain an answer grid, so the correct answer is embedded in the explanation. But I tried NOT to read the explanation at first, and just to find whether I had answered correctly. On any question I got wrong, I would then
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