There appears to be little correlation between cost per student and test scores.

Numbers show gaps in test scores, money spent on students

Jarek RutzHeadlines, Education

The amount of money spent on Delaware students in 2022 varied widely from school to school and can’t be correlated with results on standard tests. The average per student expenditure for the top 10 performers on the Smarter Balanced Assessment – taken by students in third through eighth grade – is $17,894. It’s $11,489 for the schools that did best …