(It) made a massive improvement in my school performance.
(It) made a massive improvement in my school performance.

Hi!  As a student  I feel that the chart wheel was one of the small inventions that made a massive improvement  in my school performance. I believe that this would also be a useful tool for a biology class or chemistry class where you have to memorize a lot of information.

-V. Tinsley, Central H.S. (Newark, NJ)