Level 3 Costing: Opening WIP FIFO & Weighted Average Method

Currently studying Level 3 Costing, has anyone had a question in the actual exam relating to the above? I have got 6 mock tests, 2 of which on the AAT website and none of them feature any questions to do with this. Just asking as I am finding it hard to grasp and don't want to waste my last 2 days of study before exam trying to learn something I may not need to!
Thanks,
Thanks,
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