Pop star Justin Bieber, who turned 18 in March, has graduated high school.

"I passed my test -- I'm free!" the singer told the Sydney, Australia, newspaper The Sunday Telegraph. "It was hard doing school and work every day," he added.

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It was unclear if Bieber, who has said he utilized a tutor, was referring to the General Educational Development (GED) test, the standard exam used for a high-school equivalency diploma.

Bieber -- who was signed to a music label at 14 and had his first hit record the following year -- told the paper that finishing his high school education "was something my mom really wanted me to do, so I had to do it for her."

It would not have been his preference, he admitted. "This kind of lifestyle has given me a different perspective on life," he said. "I've been able to travel the world. At school, usually you have to do a lot of writing and reading. I'm really not into that stuff. I like to be out there."

While the notion of living a normal teenage life has crossed his mind, he said, he realizes that, "If I [were] in Canada, I'd be wishing I was here doing all this stuff. I'm really happy to be where I am and I wouldn't trade it for the world."

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Bieber recently tweeted that he was releasing his new single, "Turn to You," this week ahead of Mother's Day as a thank you to mom Pattie Mallette. "The proceeds will go to help other single moms," he wrote.