A national program that encourages high school students to enroll in advanced placement classes is now in place at a fifth Oahu public school — Kailua’s Kalaheo High.

The National Math and Science Initiative presented a $112,000 check to Kalaheo on Monday to help the school expand its AP courses, and to use as rewards for students who score high on their AP exams. 

Kalaheo will join Campbell, Leilehua, Mililani and Radford High Schools, who launched their programs to boost college-readiness in recent years. The initiative at those schools has resulted in increased participation in AP courses and higher scores on AP exams. 

In the 2012-2013 school year, the four high schools showed a 65 percent combined increase in the number of students taking math, science and English AP exams, according to a news release from the state Department of Education.