Is **** considered a brain **** site?

in CCNA & CCENT
I am member of 2 CCNA study groups on facebook. One of the members said that part of what he used to pass the 200-301 exam was ****. I have heard that they are a brain **** site. Does anyone know if that is true?
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Focus on what you are trying to achieve. I found CCNA to be pretty challenging when I did it. There are simply too many legit resources these days for study materials. Use Boson prac test, packet tracer, David Bombal on Udemy, Wendell Odom book.
Good luck