Ds (15) is in year 11 and has his GCSE's next May. His way of revising is reading a small subtopic from a revision guide/the specification then scribbling it down without looking and going over what he forgot/filling in gaps in his knowledge. He also does past papers.
I had a friend round the other day who also has a ds in year 11. She said that the way ds revises will get him nowhere and doesn't work for her ds. Her ds writes out notes and files them, and reads over them when he wants to. She said obviously my DS is doing it wrong as he's predicted lower grades than her ds (mine is predicted 3 7s, 4 8s and 2 9s whereas hers is predicted 11 9s). She was a bit rude about it, saying ds will never get decent grades 
I think ds was a bit miffed as since using this technique his grades have improved dramatically and he is a lot more motivoted than he was. AIBU to think different revision techniques work for different people??