What is the best thing i can do ?

Im 14 yr old girl and go to high school in 9th grade. for the past 3 weeks I didn't go to cl as i was involved in the school musical as a dancer so im not up to scratch with school work, my school laptop won't let me log in so i can study for exams, it keeps coming up with "User Profile Service Service failed the logon" and i have an english ignment on there i havnt finished and its due tommorow, and also i have a maths exam tommorow and i dont know anything about what im doing and i really dont want to fail or my parents will be angry at me :\