Concerned for his education, Obama's mother sent him back to Hawaii to live with her parents, Stanley and Madelyn Dunham, and to attend Hawaii's prestigious Punahou School from fifth grade through graduation from high school. While Obama was in school, she divorced Soetoro, returned to Hawaii to study cultural anthropology at the university, and then went back to Indonesia to do field research. Living with his grandparents, Obama was a good but not outstanding student at Punahou, played varsity basketball and, as he later admitted, "dabbled in drugs and alcohol," including marijuana and cocaine. As for religion, Obama later wrote, because his parents and grandparents were nonbelievers, "I was not raised in a religious household.