I am not an accomplished Scientist. I am certainly not an accomplished physicist. But I can full appreciate this piece of fantastic marking and feedback.
Step 1 Lesson. Students are taught the content.
Step 2 Student sit the mock paper.
Step 3 The mock paper is “fast marked.” By that I mean, instead of offering extensive feedback on each paper, merely apply exam marking policy. Tick and score.
Step 3a Photograph some of the most effective student answers (from different students) to individual questions as you “fast mark the papers.”
Step 5 Drop the photos into Powerpoint. Along side the photographs, outline where, how and why the exemplar answers gained marks. Now you have created your feedback resource.
Step 6 Return the fast marked mock papers with copies of your feedback resource. Get the students to review their mock papers using the feedback resource to compare, or develop their responses.
Here is another example, this time with the keyword in red, circled in the question. 
Another with quite extensive reference to the mark scheme in student speak.
And another, with clear exam technique instruction, or at least identification of an exam question pot-hole.
And here is the entire feedback resource, for a short while anyway. Hat-tip to our Science Department, who, incidentally, are looking for two new science colleagues to join the team.
Finally, for the record, this marking experiment was not created an exemplar practice, nor was it the teachers intention to share resource. I am sure he would appreciate constructive feedback, and should you try it our for yourself, to hear of your experiences.
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