I would need the tablet as a 2 screen for my laptop at school. (to create 3D projects)
Can I connect the tablet to the laptop via hdmi with the appropriate app (eg Splashtop)?
or does anyone know another Powerful Tablet that I can use?
I do not know that's possible. The current iPad can do that from home, but on Android and in conjunction with Windows. I think that will not work. Why do not you just plug in a second monitor?