Can anyone tell me how to add this school finding widget which is shown in this blog http://www.administrativeassistants.com/ in this blog there is a widget about school finiding... can anyone tell how to apply for it or how it works?
That's not a widget. They programmed that. Probably from scratch and had to input all of the information. I'm pretty sure it's not something that you will be able to just download and install. you will either have to build your own, have someone do it for you, or ask them if you can use theirs. There is, however, a WordPress Google Maps Store Locator plug in. Maybe you can use that for your locations, and make some slight language modifications or swap out some icons to make it for schools, instead of stores: http://wordpress.org/extend/plugins/store-locator/