The 'Boyfriend' singer confessed that he was not happy while focusing on his studies but completed his high school equivalency exam in order to please his mother.
"I passed my test - I'm free," Bieber revealed in an interview with The Telegraph.
"It was hard doing school and work every day. That was something my mum really wanted me to do, so I had to do it for her. I mean, this kind of lifestyle has given me a different perspective on life."
The 18-year-old added. "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."
Earlier this month, Bieber announced that he plans to release a track dedicated to his mum on Mother's Day.
Watch Justin Bieber's video for 'Boyfriend' below: