53/54 as a percentage is 98.15%. This tiny fraction is just a little less than a whole, so when you turn it into a percent it looks almost like 100%.
The fraction 53/54 means you have 53 parts out of a total of 54 equal parts. In everyday terms, that's like getting 53 out of 54 points on a test—pretty close to perfect.
Because it’s so close to one, the percentage shows why it’s such a high score. Anything above 90% already feels excellent, and 98.15% is right at the top of that range.