the best way to save money like mad before I go back to study?

I’m selling my car that’s quite expensive and getting a cheaper car, that uses diesel.
I’m buying hardly any extra clothes or shoes
I’ve sold loads of stuff on Ebay
I’m living at home with my parents.

I only have 1 full time job

Do you suggest working full time and part time to save like mad? I wanna return to study in september and so will have to work only part time when I’m studying. How can I save or make more money?

get two more PT jobs and don;t spend ANY money