Does looking at the right brain left brain test and making it go left whilst concentrating, improve the left b?

The dancing girl isn't accurately testing your brain. And no, most of the people can make it go anti-clockwise by concentrating and it does not improve your left brain to work more. Actually, your left brain works more than you think. If you like to draw or do creative works too much then you're using your right brain and that eventually helps to improve your right brain. If you like fantasy more than logic and reality, you're right brained. If you like taking risks and if you're messy then you're right brained. Left brain and right brain can be only tested accurately by judging your activities and in what you're good at. That dancing girl is just fake and it doesn't really mean anything except for entertainment.