A - Level Mocks vs Real exam grades

Was wondering what people got in their mocks vs their real exams for a levels, specifcally chemistry and economics would be helpful but all other subjects would be ok

If you think about this, no responses are going to you tell you what you are going to get in either your mocks or the real exams, especially since mocks are set and marked by the schools themselves and have no universal or comparable 'standard'.
Best to either get on and do some revision - or let go for a while and just go to the cinema.

I am asking how much progress can be realistically be made from december to may/june, I am not asking for what grade will I get

That clearly depends on how much work you put in.