uring ▁average ▁score , ▁percentage , ▁or ▁ranks ▁since ▁the ▁P CS AT ▁has ▁more ▁similar ▁sample ▁groups ▁to ▁the ▁CS AT ▁than ▁private ▁mock ▁tests ▁do . ▁ ▁Institution s ▁in ▁charge ▁ ▁March : ▁Se oul ▁Metropolitan ▁Office ▁of ▁Education ▁( sen iors ; ▁fresh men ▁and ▁s oph om ores , ▁ 2 0 0 6 – 2 0 0 9 , ▁ 2 0 1 4 ), ▁Bus an ▁Metropolitan ▁Office ▁of ▁Education ▁( f resh men ▁and ▁s oph om ores , ▁ 2 0 1 0 – 2 0 1 3 ) ▁ ▁April : ▁G ye ong gi - do ▁Office ▁of ▁Education ▁( sen iors , ▁since ▁ 2 0 0 3 ) ▁ ▁June : ▁Bus an ▁Metropolitan ▁Office ▁of ▁Education ▁( f resh men ▁and ▁s oph om ores , ▁ 2 0 1 4 ), ▁Se oul ▁Metropolitan ▁Office ▁of ▁Education ▁( f resh men ▁and ▁s oph om ores , ▁ 2 0 0 2 – 2 0 0 4 , ▁ 2 0 1 0 – 2 0 1 3 ; ▁sen iors , ▁ 2 0 0 2 ), ▁In che on ▁Office ▁of ▁Education ▁( f resh men ▁and ▁s oph om ores ▁ 2 0 0 5 – 2 0 0 9 ) ▁ ▁July : ▁In che on ▁Office ▁of ▁Education ▁( sen iors , ▁since ▁ 2 0 0 7 ), ▁Se oul ▁Metropolitan ▁Office ▁of ▁Education ▁( 2 0 0 5 ) ▁ ▁September