I know everyone says it but your year 10 mocks do not matter. You might have your teacher/classmates expectations and predicted grades weighing down on you but that can be easily changed in the year 11 mocks. I was in the same shoes as you, completely stressed for year 10 mocks but they did not affect me in any way whatsoever. Don't use these mocks as a way to see how intelligent you are, instead use it to check if your specific revision techniques are helping you get the grades you want. If not, don't worry about it. You can use it to improve for the next set of mocks.