If anyone is still not understanding, - although I think most are, having read the replies (and I have found this heartening), I have a few examples.
Kids that are in care, or have been in care spend many of their important, formative years in survival mode.
For example, my son has a photographic (for want of a better word) memory - but that's not because he's ultra smart. It's because it's a survival technique he's learnt from birth. If he can remember stuff, it keeps him safe. If 100 people walk into a room, he will remember their names, the order they walked through the door and the mood they were in. Pretty impressive right? He does this because he saw a lot of really bad stuff. If he can remember these things, then he knows when he has to make himself small, to keep himself from drawing attention, to keep himself from being in the firing line - just imagine how knackering that must be and how much brain power that must take, before he even has to think about learning.
My daughter on the other hand was just left in her cot, to cry, she never got her basic needs met - nappy changes, cuddles, FOOD. On the face of it, she's incredibly independent, she doesn't want to have to rely on anyone. She will do anything for attention though, to be seen, and then when you give her attention, she will push you away, before you push her away, because everyone else has let her down, so why wouldn't you? I loved her so much, but she didn't let me in for the first two years.
All of this on top of expecting them to learn alongside other children that have had their loving parents next to them the whole time.
There just seem to be such a lack of understanding of what these kids have to do - to just survive, and what they have to overcome just be on a level playing field.
Any advantage that they can get, is definitely owed to them and I will fight tooth and nail for that advantage.