I'm not sure if this is the right place but I need some help with school...

I'm not sure if this is the right place but I need some help with school... Sorry if this is too long, I just wanted to fully explain the situation Hi I am 15m, I am autistic and i struggle with anxiety, ADHD and depression. I am currently doing my GCSE's. The reason I came here was because I'm struggling with two subjects (English Literature and Digital) Whenever I am asked to read our loud in lit i feel like everyone is watching me and even by the point I know people aren't i know for a fact that there listening and this causes my anxiety to come out and I start stuttering and figiting and then it get worse and worse till I'm done and I just want the ground to swallow me up and then I get anxious for the rest of the lesson and then I loose focus and if the teacher points out a mistake or something wrong at that point it's as if I want to speak but can't even open my mouth and I just stick to nodding. Then in Digital I have had to make a game which is fine but now I have to make a PowerPoint presentation about said game and present it to a group of four people and my only friend in the class has already done it so I won't have the comfort of her and I'm panicked that I'm just gonna make a mess out of my self stuttering and figiting and that I won't even be able to finish I currently have a two week break, does anyone have any advice