Well... yes, but is that the best use of your time?
From what you have said, it may be if it helps you to clear and cover areas. I would suggest focusing on the questions you get wrong (those 10-20%) and try to get as much learning value as you can.
One note to those who try to do questions that are harder/much harder - that's probably of least value at this time for you. Ideally you would find questions that are around your level of difficulty (slightly lower and slightly higher are good too).
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