A PDF study manual
Authoritative and complete - and a reference, not a teacher. It tells
you what is examinable. It cannot tell you whether you could answer it
under time, or which topic is quietly costing you the pass.
A video course
Good for a first pass through unfamiliar material. Then you are back to
finding questions that match it - and you cannot search a video for the
one rule you have forgotten the day before the exam.
A question bank
Drills you properly, but only tests. Get a topic wrong and it hands you
more of the same topic without ever teaching it, so you practise the
same gap until the day.