After taking a 200 question test (full mock exam) and a buzzing mind, do you usually go over all the 200 questions again or just the ones which you got incorrect?

I am assuming going over the full test again would hog 4 more hours, on top of the 4 hours allocated for exam taking - which means 8 hours gone just on one single test.

What's the "best practice" followed amongst you smart folks :-)?