The exam examines everything in the syllabus and therefore you have to study all of it – you cannot simply pick a chapter!!!
You should watch all of my free lectures (using as well the lecture notes) – they are a complete course and cover everything needed to be able to pass the exam well.
Also, you must buy a Revision Kit from one of the ACCA approved publishers, and you must practice every question in it if you hope to pass the exam.