(Sorry Sally-Anne, don't want to be 'House Elf' as in HP films, getting near the big 5-0 and I keep picturing wizened image of House Elf as I look in mirror in mornings!!)
You are welcome to be a 12+ Elf instead!
The questions are of exactly the same standard as the 11+ - just a few more in a few minutes less.
Yes, only half the question types will feature in the test, but the problem is that you don't know which half! There will (on past performance) definitely be one Type Z question, and as always it should be left to the end.
Thinking of you - fingers crossed!