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As mentioned above he usually draws them so that we can better visualize what is happening during the reaction. I would be surprised if we had to draw one for the test, but I could see one being given for us to use as part of a question.
Knowing how to draw the lewis structures won't specifically be tested (I think), but it will just help with being able to understand what happens during a reaction when doing problems with acids/bases, salts, etc. so that you can see the proton/electron transfers.