Section A is computer marked. For section B I suggest you go to the Acca exam resources and look at the past exam reports as well as read the mind of the marker to understand what the markers are looking for with each type of question. Study the notes alone won’t make you pass if you don’t know how to answer the questions to the marker’s requirements.
@roban – in answer to your first Q – no – there is no partial marking (unlike for on-demand CBEs where the award of partial marks may be indicated). For session CBEs – each OT is worth 2 marks and the award is either 2 marks, if wholly correct, or 0 marks.