Oxbridge Exam Stress

I received an offer from Oxford last week and then proceeded to do terribly in my mocks, I'm rlly concerned now that I won't meet my grades and was wondering whether anyone else was/is in my position/can offer words of advice? I'm currently doing ~5-10 hours of revision per week.

Which A-Level subjects are you studying?

The key is to do as many past exam paper questions as possible, 'scrutinise' the mark schemes and gain knowledge from the examiner's reports as well.