How to do this kind of windows movement in VIM?

Question

First I have three windows splited like this:

|    |    |    |
|    |    |    |
| A  | B  | C  |
|    |    |    |
|    |    |    |

So, how can I change them into this way?

         |      |
   A     |      |
_________|  C   |
   B     |      |
         |      |

This happens when I want to use both TagList & NERDTree. Both of them open a new window on the left side.

Answer 1

1. go to A and Ctrl-w K

   now your window should look like

   |    A    |
   |---------|
   |  B |  C |
   

2. then go to C and Ctrl-w L