Hey @Lime_Starling 
I'm so sorry that to hear that you have been going through such a stressful time. It seems that you have been dealing with some tough family issues, and on top of that you also have your school stuff to worry about.
Firstly, I 'd like to ask if you are currently safe? Are you still at your parents' house?
You may contact 000 or 1800 55 1800 (Kids Helpline) if you ever feel unsafe, or threatened. Remember, you're still a minor and you cannot be asked to leave your house. And it's not your fault in anything. You can reach out to your relatives or other friends whenever you need to.
I just want you know that you are not alone. We are with you. Thank you for reaching out to us. We will be getting in touch with you shortly.
Please let us know or inform the emergency services if you feel threatened or unsafe.