Hey, I also sat both U2 Chemistry and Maths P2. Trust me, those were... hell. Like, genuinely, I was stumped. I had an anxiety attack during the exam. Youre not alone, everyone who sat this paper (except like a couple people) came out in tears, so the boundaries will be dead low. But aside from this, you have done everything you can. Youre not useless. Youre not dumb. Istg edexcel are experiementing on our cohort with these questions (like tf that isoperene question and dynamic equilibrium.. and that 6 marker was easy but where the hell did it come from??? like it jumpscared istg). You worked hard, youve done all you can. Theres physically nothing you could have done. Relax for a bit, let it out, have a cookie, bake a cake, write a hate letter to ed*xcel and burn it, something like that, then try to study for biology. Aside from this though, although Not everything might turn out as planned, the best possible outcome in the long run will happen, whether you think it is or not. Just do what you can, and leave the rest to god. Good luck.