I'm not sure, but I can suggest one alternative: Try the Pencil Tool.
If you're trying to get pixel-perfect editing done you'll want to use Pencil instead of Brush, because the latter anti-aliases pixels when it works.
Thanks I will do. Also, I have other problem. In CS6 there is this option where the brush will randomize after each stroke. Is there a way to stop this?
Make the Brush panel visible via Window - Brush, then look and see what Dynamics you have enabled there. There's one called Scattering for example with a Jitter setting that will randomize things.
If that's not on target, please describe what you mean by "the brush will randomize", maybe post some additional pictures.
I have to say, the picture you posted above does not even look like something from Photoshop. Are we talking about the right product here? Adobe Photoshop CS6?