An odd collection of topics and diseases fall into the general haematology zone, but it is definitely not just the 'leftovers'. There are some big subjects here that examiners are keen on.
NEQAS will always feature somewhere in the exams, and it is important to be familiar with looking at their reports. Unfortunately most of my notes on NEQAS are direct cut and paste jobs from Blood Academy, and since this is a paid resource I will not post them here. That said, I found the blood academy NEQAS tutorial very useful and a subscription is very good value for the content provided.
Other free online resources: