Why aren't they getting it?

Three lessons on solving equations with a lower ability set should hopefully ensure they can get liner equations with two variables in them. Three students aren't getting it, they're not any worse than anyone else and should be solid.

It's not a new class to me but there are some characters who have come up from an even lower set and I've been spending some time with them more than I should. I also think that I've underestimated the students who have come up.

I reckon it's because I've sat the kids that I know next to each other assuming they're stronger, as I'm not sure it's the case I think I need to mix it up a bit....must check up on them though.