unofficial ms

wait guys i’m so fricking scared. okay so I had biology paper 2 today and I thought it was okay. I did like paper one better but I thought this was okay and I am aiming for an a/a* you know. in past papers I’ve been getting in that range but today when I checked the unofficial mark scheme I got 50 marks which is just on the B so how accurate are these? I’m really scared. I don’t know if I’ve marked too harshly. I’m just so so so scared because I just feel like I’ve failed everything now and yeah. in no way do I think a B is a bad grade but for me personally because I wanna go into medicine/dentistry next year it’s like I need to get like an A or A* and that’s why i’m scared because I don’t know what I did and I don’t know and I’m I don’t know. I’m just really scared Ive underachieved like massively