Scientists estimate that the modern human brain can hold up to 1 quadrillion pieces of information in a lifetime. That’s 1,000,000,000,000,000 with 15 zeroes. Even though our brains are built for processing and storing information, sometimes remembering even the most basic facts from grade school is a challenge. How much knowledge do you think you’ve retained since your time in school? From literature and history to science and mathematics, we’ve included questions on a variety of subjects to see if we can guess your education level. Take this quiz and see if we get it right!