I am just about to start self studying Level IV ABA8 and ABA9 when my books arrive.
There is a mock for ABA8 in the ICB shop under Mock Assessment Online 2014. I was told recently by ICB that the ABA9 mock will be available shortly.
I'm not sure what to expect from these studies either but expect that it will be much more demanding for me than the new Level II and Level III which I have just completed by self study. This is mainly as I have already been doing bookkeeping up to partnership level for a few businesses that myself and my husband have had over the years but the next level is fairly new to me. However, I believe that the new exam structure is more manageable as the exams are broken down into smaller portions so we don't have to remember as much information in one go. The old exam structure for Level III Diploma included Partnerships and Not for Profit as part of that but if you have done the new exam structure then you will have already covered these subjects in Level III Certificate.
How are you studying for this course - are you using a Distance Learning Course?