Premium alone would be better than the book alone in my opinion.
At least then you'll see exactly what is in the book and then you can decide if you want your own hard copy.
Having the book in hand while watching the premium class room lectures will give you the opportunity to take notes in the book and then bring it with you to work. Then if you can't remember something you can flip back through your notes.
"Ground cannot be checked with a 10mm socket"
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