Our notes and lectures are always kept up-to-date for the current syllabuses.
The notes on their own are not sufficient because they are lecture notes (not Study Texts) and should therefore be used along with the free lectures. It is in the lectures that we work through the notes and explain and expand on them.
Provided you are watching the free lectures, you do not really need a Study Text. However, regardless of how you choose to study, it is essential that you buy a Revision Kit from one of the ACCA approved publishers (BPP or Kaplan). The reason is that they are full of past exam (and other exam-standard) questions (together with answers and explanations), and question practice is vital to passing the exam.