I go through the answers and have the pupils write in corrections in a different colour pen. It is meaningless unless they have their own papers in front of them. I take the papers back in but the act of writing out the corrections should help at least some of the answers stick.
My actual marking is simply circling the marks for the question (if they get full marks), or the maximum mark crossed out with the actual mark I have awarded them written alongside. I don't actually correct their answers or write any comments. Some of my colleagues do that, but I whizz throught the marking.
It is tedious, and difficult to get through to the end of the paper in the lesson following exam week.
I give an overview too, and major tips, but most tips/techniques will be reserved for Easter holiday revision classes. All they are interested in is their grade and the grade boundaries, and they switch off easily.
When giving out grades, we have to go through a charade of keeping their marks private from the rest of the class. I have their grades on an Excel spreadsheet, where I apply a filter to their names. I then get them to come up and look at their own grade, and they then promptly sit down and tell everyone else.
When I was at school and uni, your marks were posted on the notice board for everyone to see. How times have changed.