CBT Nuggets for 70-686 not correct?

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Hi, I've been looking at the CBT nuggets for 686 but the guy mentions the 646 exam more often than not.

Has anyone used these? Are they multipurpose videos or inaccurate?

Cheers.

 

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As the 646 is Server 2008: Server Admin, I'd guess there would be some overlap with 686, so they may have re-used some video sections?

Could also just be a slip of the tongue, though.

I have these but not started studying it yet - planned for next month, so I'll keep an ear open for it when I'm watching.

 

Cheers. Seems to be ok after a flick further into the video there's mention of 686 again. It's a little confusing, just thought I'd check.
I am confident this exam's going to be tougher than it looks.