Yes, at the Punahou School, a private school in Hawaii.
No.
He enrolled there in fifth grade, in 1971; and he graduated in 1979 (the Punahou School has middle school as well as high school, so young Barack attended for about eight years total).
Indonesian
Punahou School in Honolulu, Hawaii
1946
Barack Obama entered the Punahou School in Honolulu in the 5th grade, in 1971. He began the 8th grade there in 1974. He graduated (Punahou included what was then called Junior High, and also High School) in 1979.
Hawaii
Barry
Barack Obama attended the Punahou School in Hawaii (an elite private high school); he graduated in 1979. He then attended Occidental College in Los Angeles, transferred to Columbia University and graduated in 1983; he worked for a while and then graduated from Harvard Law School in 1991.
He graduated high school in Hawaii, from the Punahou School in Honolulu, in 1979. He got his Bachelor's degree from Columbia University in New York in 1983. He received a JD (Doctor of Laws) from Harvard Law School in Cambridge MA in 1991.
He graduated from the Punahou School in Honolulu, Hawaii in 1979.