Mark Wahlberg says he’s returning to school to study for his high school diploma.

The actor dropped out of school in Boston at the age of 13 and, after a stint in jail for assault, he became a model and pop star and later, an actor in Hollywood.

But now Wahlberg says he’s keen to go back to school so he can become a better role model for his children.

"I am going back now. They have this new programme in Massachusetts now where you can actually take the courses online, so I'm starting this month,” he told chatshow host David Letterman. “I'm gonna go and get my high school diploma."

He's hoping to take advantage of his spare time in between filming so he can speed through the tests and graduate within months.

"It's an actual diploma, so I gotta take up all the courses that I missed and I'm a little nervous, but . . . I have a lot of down time on sets and in trailers so I just wanna blast through (the course),” he says. “Hopefully be able to do it (graduate) in six to eight months."

Wahlberg added that he also feels guilty serving as the spokesman for U.S. fast food restaurant Taco Bell's Graduate To Go programme, which provides support to at-risk students.

"They asked me to do this and I was like, 'Dude, I never graduated, why would you pick me to do this?'"

He also says that he wants to go to film school after he has passed his high school exams.