Comment by wildzzz

I had a Continuous and Discrete Systems class that allowed open everything during exams. You could google whatever you wanted but the exam was so lengthy that if you had to google something, you really did not have much time to do it and would definitely not have enough time to do it a second time. I would load up a PDF of the chapters and lectures I needed and my homeworks for that unit with everything properly labeled. It was much faster looking for a similar problem you already did in the homework than trying to find the answer online.