The Downingtown STEM Academy ranks second among high schools in Greater Philadelphia with the highest percentage of students scoring advanced on the Keystone Exams, according to a report in the Philadelphia Business Journal.

The exams have come under heavy scrutiny in recent years, and have been suspended as a graduation requirement by Gov. Tom Wolf until 2019.

The exams measure the proficiency of students in a number of subjects, with the emphasis on Algebra I, Biology, and Literature. The PBJ used data from the Department of Education for the rankings, and used the percentage of students who scored at the advanced level. It added the percentages together to come up with an overall score.

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Chester County high schools accounted for 13 of the Top 50 in Greater Philadelphia, which also includes Philadelphia, Bucks, Montgomery, and Delaware counties. They are (with total score in parentheses):

• Downingtown STEM (195.8)
• Unionville (155)
• Conestoga (147.3)
• West Chester Rustin (121.8)
• Great Valley (120.4)
• Owen J. Roberts (103.9)
• West Chester Henderson (95.3)
• Avon Grove (90.6)
• West Chester East (88)
• Kennett (87)
• Phoenixville (86.5)
• Downingtown East (82.6)
• Downingtown West (76)

Read more about the rankings in the Philadelphia Business Journal here.