Update: Pebblebrook Makes America's Most Challenging High Schools List

Update, 2:40 p.m. Wednesday

Another Cobb County school made The Washington Post's list of America’s Most Challenging High Schools.

Out of 1,982 schools nationally, Pebblebrook High in Mableton is No. 1,924. Within Georgia, Pebblebrook is No. 109 out of 113 schools on the list, according to The Post.

That means 12 Cobb schools were included in the 2013 list.

Original story, 5:50 a.m. Tuesday

Eleven Cobb County schools were included in The Washington Post's list of America’s Most Challenging High Schools.

Walton High School had the highest ranking of any Cobb County school, coming in at No. 3 on the state list and No. 163 on the national list.

The Post's ranking system calculates the number of advanced placement, international baccalaureate and advanced international certificate of education tests given at a school each year, and divides it by the number of seniors who graduated that year. A ratio of 1.000 means the school had as many tests as graduates.

Other Cobb high schools that made the list include:

• No. 20 in Georgia: Lassiter High School
• No. 35: Harrison High School
• No. 44: Campbell High School
• No. 48: Pope High School
• No. 56: Wheeler High School
• No. 65: Sprayberry High School
• No. 67: Kennesaw Mountain High School
• No. 71: Kell High School
• No. 72: North Cobb High School
• No. 95: Hillgrove High School