When we say ranking, we generally refer to the ranking of USnews. In this ranking, American universities are divided into four grades (four levels), the top 200 are Tier 1, the next 200-300 are Tier2, the third 300-500 are Tier3, and the fourth is after 500. Moreover, starting from Tier2, schools at each level have no specific rankings, only which level they belong to. Tier3' s school is really not very good, but after all, it is not a diploma workshop. Don't mislead others upstairs.