3 kids, No time to worK

I don’t have time. I work at home. I make some coaching but I have 3 kids at home. I am alone. I have to do the class for the 3 kids ( 5,7,9 YEARS OLD) so I don’t have any time to coach at the morning and at the afternoon, they take care of them because they are young. So the result I want is :
C I have 3 kids at home, I do the class, the lunch,dinner, I buy the food
R I do all my work

I don’t know how to do all my stuff, because for that I have to have other C