在Ruby中找到哈希数组中的最高值

I have an array made of several hashes. I would like to find the highest value for a specific key/value and print the name value for that hash. For example, I have a "student" array of hashes containing information to each student. I would like to find which student had the highest test score and print their name out. For the array below, "Kate Saunders" has the highest test score, so I would like to print out her name. I have an array made of several hashes. I would