The best tip to increase CPS.
Player Vs Player games allows you to get more concentrated on both games and clicking, and PVP is really a good way to increase your clicking speed. The only down side of PVP is you have to take care of both the game and clicking.
Get Engaged in PVP
Yeah, I know it's a pretty obvious solution, but sometimes getting a better mouse could help. Logitech, Crosshair, and G-Wolves are some companies that sell gaming mouse. But, buying a new mouse is not mandatory.
Yupp, better mouse could help
CPS Test is a kind of test in which you have to click a specific button of your mouse or keybord in order to know how much key strokes you can press in a given limitation of time. Basically, a test that allows you to know your clicking speed and improve it.