To get your mom to let you stay home from school you'll need to fake being sick such as faking having a stomach ache, stomach flu, or the flu itself.
Moan and groan or go into the bathroom and lean over the toilet early in the morning before your parents wake up and start acting like you're gonna throw up in the toilet and then when your parents ask you if you're okay tell them you are but then go back to your room and try to get dressed as normal and then act like you're gonna throw up again and run to the bathroom.
Your mom may think you're actually sick with the stomach flu and insist that you stay home from school.
Just don't act too excited about it otherwise your mom will figure out you're faking sickness to stay home from school.