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Do people BR all of the questions in the Problem Sets or just the ones that you have flagged? Based on what JY says in the BR section it seems to be that you ignore the ones that you don't circle? But in the comments everyone seems to BR everything
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You can do either. The point of only reviewing the ones you flagged is to gauge if you know when you don't know the answer. I found that until my understanding of the material and the fundamentals improved drastically, I didn't get much from the flagged BR alone as I was missing not catching my own mistakes reliably. I needed more time with the questions and to really understand what I missed. For me, it was one method then the other as I gained confidence that I knew when I might have missed a question.