Are you cleaning it up just for esthetic reasons, or is there some problem that needs to be fixed?
There are many reasons why different breakers are used in the same panel. General purpose wall outlets, overhead lighting, high power appliances, etc. will need different size wires, and different capacity breakers.
And if you don't know EXACTLY what you are doing, it's better to call an expert. A 240 volt shock, even if it doesn't kill you, is not a pleasant experience. And a misswire that results if a fire, could kill your whole family.