CS 6 Help - Magic Wand Tool

Magic wand tool has + and - settings (top bar) so you can chose whether it selects an area to be included or excluded. So if your selection has included too much go back to the 'extra' area with the setting on - and reduce the area to where you want it to be.
 
Or hold down alt and click on the selection you want to remove (does the same as above)
 
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