Hi Ramesh,
You can go into Admin -> Field Management and then pull in your score field(s). For each field it will give you a list of the smart campaigns and smart lists it is used in.
Another way would be to use the Treasure Chest "Campaign Inspector". Easy to enable, it will allow you to search all of smart campaigns and you could look for "Change Score" flow step. You can also only look in active campaigns. You can find the Treasure Chest under Admin to enable and then the Campaign Inspector will be available in your Marketing Activities tab (at the top).
Regards,
Sheila