how to make a Shortcut for Last style I used for photoshop ?

You can easily copy and paste styles from one layer to another. My preferred method is to simply hold down the option or alt key and drag the style to the new layer. If I need the style on muliple layers I rt. click, on the layer, choose copy style, select all of the other layers and paste style. If I love my style and want to use again I save it into my libraries.