Our Lecture Notes and the Lectures that go with them are enough, provided that you also get a Revision Kit from one of the ACCA approved publishers (BPP, Kaplan, or Becker). The revision kits contain lots of exam standard questions to practice, and practice is vital.
You do not need a Study Text – if you do have one, then best is to use it more as a reference book for extra help on any topics you have problems with.