I am so sorry to see you in stress.
Year 13 is one of the toughest years - mine was tough too - like extremely tough. I experienced stress coming from not knowing what my future will be like, having to go through big changes depending on how you do this year and also there was the pressure that I need to do well academically coming from my family and friends. Have you been to psychotherapy to talk about your feelings? I personally massively benefited from it. It made me feel like I am not alone when I go through the tough time.
When you are stressed with your assessments, interviews and exams, I find it helpful when you do little by little everyday. You set your goals for the month/week/day and on the day, just focus on what is given then take yourself on a date to relax.
I like to go outside to a café or somewhere cosy to study. When I am at home I like to make the environment aesthetic and romanticise my life like I am in a movie.
Things will work out in the end 🫂