The rapper and actor Drake says he has passed his high school equivalency exam, 10 years after dropping out of school at age 15 in order to join the cast of "Degrassi: The Next Generation."

On his Twitter page Wednesday night, he gave props to his tutor, writing, "Thank you to my teacher Kim Janzen for spending the last 5 months working tirelessly with me!!"

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His GED scores, he wrote, were "97% on my final exam. 88% in the course. One of the greatest feelings in my entire life. As of tonight I have graduated high school!"

Lack of formal education hasn't held him back -- Forbes magazine in 2011 ranked him the sixth-highest earner in hip-hop, listing Aubrey Drake Graham (his full name) with annual earnings of $20.5 million, which included proceeds from an album that moved 631,000 copies in its opening week alone.