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There are many benefits to timing your practice, including:
Asking me is like asking the junior mechnaic to rebuild your engine.
But since you asked, I almost always try to plug first-- in part because I make too many computation errors the other way.
As you go through the OG, if you time yourself (as you should), make a note of any question that takes longer than 90 seconds and see if you could have done it faster by plugging. This should be especially easy if you can narrow the answers down to two before you start the problem.