The Bronx High School of Science is a specialized school.
Here are some papers its students published this year: https://www.bxscience.edu/apps/pages/index.jsp?uREC_ID=3719&...
A similar institute is the North Carolina School of Math and Science, and their current newsletter is here: https://broadstreetscientific.ncssm.edu/
This type of content is not representative of the average high school's mathematics curriculum in 1957.