Student Loan worries?

Hi!
So my parents are in the process of separating, my dad is about to move out so I'll be living with my mum from now on. When applying for student loans, do you enter the household income of the parent you live with, or is it joint? I'm really worried about money now, is there anything I can do? Should I try and get another job (I quit my last job to focus on my studies) or focus on my A levels as I'm applying to Cambridge?

Thanks!

it will go off the parent you live with's income