Did you fall asleep once so you couldn't go to school? That wouldn't be good that much. Parents also cannot be late to work, that could cost their own jobs, and they're very important. That's why you should set an alarm every day and then you won't be late. Suggest this to your mom too, this is very important for the whole family. But don't worry, this does not mean that you won't sleep much, you just have to go to bed earlier the day before, so you can wake up in the morning with no problems. Then, if you know the lyrics, just sing the song, and don't be afraid, you'll do good!