Mark Wahlberg

Back to school ... Mark Wahlberg.

Actor Mark Wahlberg is returning to school later this month to study for his high school diploma.

The Fighter star quit his studies at the age of 13 and, after a stint behind bars for assault, became a model and pop star before making it in Hollywood.

Last year, Wahlberg admitted he was keen to go back to school so he can become a better role model for his four children - and the actor has now enrolled in an online course to complete his education.

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

Wahlberg, 41, admits he is "a little nervous" at the prospect of returning to his school books, but he is determined to pass with flying colours - and he's hoping to take advantage of his spare time in between filming movies 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). Hopefully be able to do it (graduate) in six to eight months."

WENN