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Great suggestion @MockTurtle, couldn’t agree more. I wrote 2 guides to IPS questions there too based on my previous experience. I don’t think you can teach this through a class really, you just have to study the syllabus and go through the mock papers – and it’s not about writing skills either. It’s about answering BRIEFLY AND TO THE POINT.
Also included more details about the L3 experience here where I messed up the essay bit.
Plus, no matter how you practice the mock papers, it’s not as clear cut as A, B or C. The model answer will never be identical to what you wrote and it’s worrying that way. You just have to trust your grasp of the concept, manage your time well in that section and ace the afternoon paper.
Hope these help!