I'm going to lie to my mum about applying for jobs
Why would you do that?
I don't want her to know I'm not really looking.
That doesn't really help you. It's not cool to lie to your mother about important things.
It's okay as long as she doesn't know, she should never find out.
I think your mom might notice you don't work or make money and then she will know that you lied to her. It is wrong to lie to people who care about you like your parents, they will have a hard time trusting you in the future.