The notes are sufficient provided that you also watch the free lectures that go with the notes. The notes are lecture notes – not a study text – and it is in the lectures that I work through the examples and explain and expand on the notes. If you are not watching the lectures for any reason then you do need to buy a study text.
However you choose to study, the essential book is the Revision Kit. It is full of exam standard questions to practice when you have finished your studying, and practice is vital for passing the exam.