I was taught to never begin a sentence with a numerically-formatted number, so both comments visible in the screenshot get docked points from me. While it is not technically incorrect, it is unprofessional.
I also was 'gifted', reading and writing at a college level by the fifth grade, and didn't learn anything new through and including graduating from high-school. My peers, though? Another 7 years, and most didn't absorb much else, playing catch-up.
Though I am absolutely against homework and studying at home. Usually you would think that those who dedicate time at home to studying will achieve higher grades, and to a limited extent that is correct, but it's more like an edge case than the norm. The classroom setting, while dreadful, does seem to help with information retention - at least in my experience. Beyond that, it falls off a cliff.