"Anybody got any good sites where I can find more spatial awareness cubes??"
Trust me I've searched the net top too bottom (If you can!) and found no mass of pages, pdfs, excel sheets etc, with a "lot" of cubes on them, certainly not 40.
"Also does it seem to help people if they cut out a net of a cube and mess around with it? "
It sure does. I made a few out of cardboard created some test templates/questions (40) and recruited my parents to create the test for me.
It seems to be working as they are much harder than what I have found online and have really sharpened me up while doing them. As long as you don't mark them yourselves they still have value after doing them a good few times.
"It seems the more I cram, the more stupid im getting"
Yeah. My arithmatic is fluxing between "dross" and "okay" at the mo. If I had a friend who's a maths teacher I'd be laughing...