Given the you unfortunately failed last time, then I certainly do think you should read your notes again.
I do not know which notes you are referring to. If you mean the free notes that we provide, then there is only any point in reading them if you also watch the lectures (the two go together). The notes have been rewritten and new lectures recorded, since the last exam.
I assume that you do have a Revision Kit from one of the ACCA approved publishers and that you have worked through every question. If not, then it is essential that you buy one. If you have already got one, and worked every question, that it might be worthwhile buying one from the other approved publisher so that you have different questions to practice.