False
Who wouldnt want to believe that we all have 90% of untapped brain potential in us all? Unfortunately, this is not the case. Research indicates that pretty much all of our brain is used for a variety of functions. This includes memory, visual and auditory processing, emotion, and higher cognitive functioning such as complex problem solving. Otherwise we could all afford to ride our bike without helmets and suffer head trauma without losing any brain functionality. So dont believe you have significant brain machinery that is not being used. Certainly we can improve our brain function, but this is usually through hard work and studying to get ahead in life.
Reference: Lilienfeld,S., Lynn,S.J., Ruscio, J., & Beyerstein, B.L. (2010). 50 Great Myths of Popular Psychology: Shattering Widespread Misconceptions About Human Behaviour. Chichester, UK: Wiley-Blackwell*##**##*