North Dakota high school graduates earned a 20.7 composite ACT score in 2012, slightly lower than the national average composite score of 21.1, according to a press release issued by the state department of public instruction. The North Dakota college readiness level in science equaled the national average while the readiness levels in English, mathematics, reading were slightly lower than the national average. This is logical when considering the very different testing populations involved. The national scores represent 52 percent of graduates nationwide. The North Dakota scores represent 100% of the state's graduates.