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The Inventory tag doesn't work on armor stands, but the Equipment tag does.

/testfor @e[name=Skeletor,Equipment:[{id:"",Count:,tag:{}...},{id:,Count:...},{id:...},{id:},{id:}]].

The five arguments come in this order: Held Item, Boots, Pants, Chestplate, Helmet. You want to test for boots, so I would try this command:

/testfor @e[name=Skeletor] {Equipment:[{},{},{},{},{id:golden_helmet}]}

The Inventory tag doesn't work on armor stands, but the Equipment tag does.

/testfor @e[name=Skeletor] {Equipment:[{id:"",Count:,tag:{}...},{id:,Count:...},{id:...},{id:},{id:}]}.

The five arguments come in this order: Held Item, Boots, Pants, Chestplate, Helmet. You want to test for boots, so I would try this command:

/testfor @e[name=Skeletor] {Equipment:[{},{},{},{},{id:golden_helmet}]}

The Inventory tag doesn't work on armor stands, but the Equipment tag does.

/testfor @e[name=Skeletor,Equipment:[{id:"",Count:,tag:{}...},{id:,Count:...},{id:...},{id:},{id:}]].

The five arguments come in this order: Held Item, Boots, Pants, Chestplate, Helmet. You want to test for boots, so I would try this command:

/testfor @e[name=Skeletor,Equipment:[{},{},{},{},{id:golden_helmet}]]

The Inventory tag doesn't work on armor stands, but the Equipment tag does.

/testfor @e[name=Skeletor,Equipment:[{id:"",Count:,tag:{}...},{id:,Count:...},{id:...},{id:},{id:}]].

The five arguments come in this order: Held Item, Boots, Pants, Chestplate, Helmet. You want to test for boots, so I would try this command:

/testfor @e[name=Skeletor] {Equipment:[{},{},{},{},{id:golden_helmet}]}

I see a few small problems with your command.

1. You spelled helmet wrong! Try changing golden_helemet to golden_helmet.
2. There are two opening square brackets but only one closing. Take out the second [.

/testfor @e[name=Skeletor,Inventory={Slot:103,id:golden_helmet}].

The Inventory tag doesn't work on armor stands, but the Equipment tag does.

/testfor @e[name=Skeletor,Equipment:[{id:"",Count:,tag:{}...},{id:,Count:...},{id:...},{id:},{id:}]].

The five arguments come in this order: Held Item, Boots, Pants, Chestplate, Helmet. You want to test for boots, so I would try this command:

/testfor @e[name=Skeletor,Equipment:[{},{},{},{},{id:golden_helmet}]]