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For specific revision tips knowing how you learn best will be a start and then build around that. It seemed to be working for you before, did something change that might have caused problems recently? Do you just need to change strategy for that particular material? There are loads of study technique guides out there that I realistically cannot list a lot of them but a small number includes: repeatedly writing down the material by hand, cue and flash cards, post it notes, looking up videos or audio of the material, or alternatively looking up different texts to see if you understand them better, gamification (turning your study into a game), colour coding (with highlighters or coloured pens). Feel free to experiment with this.