The 10-year-old star is set to hit number one in the UK with her new single but she said her work load has put her behind her school pals as she doesn't have enough time for studies as well.
She told UK newspaper the Daily Record: 'I never really get to go to school because I am always on tour or with my father. There is a tutor most of the time, but usually I am working, so I never get to do the lessons.
'The worst thing about maths is all the kids are ahead of me because they go to school.'
Willow is the daughter of Hollywood superstars Will Smith and Jada Pinkett Smith and her brother Jaden starred in The Karate Kid earlier this year.