In my school we had y12 mocks in june/july which were used to make UCAS predicted grades so those were the important ones. Idk how it works in other schools, but one bad grade shouldn't matter too much. U have plenty of time to improve so just focus on doing more revision so u can do better in ur next mocks
I recently just sat a maths and physics a level mock i already know i have done terrible and im worried do they matter like that ?
not particularly, start of y12 everyone’s acclimatised and it’s still too new. i got B/Cs at the start of y12 and now getting A*s with that as my ucas predicted. just show effort