Predicted grades (A level) against cohort performance

What 'performance' - within your school mocks compared to everyone else at your school?

In terms of my mock result performance against the rest of the school in my year for mock? Eg. a predicted A*A*A* does not imply I am in the top 10%-20% for the subjects I'm taking does it?

You're right it doesn't.
Is there anything you are looking for in the future that has any kind of criteria like that?
Otherwise, is there a particular reason you'd like to know apart from your own curiosity?

I'm hoping to apply to Oxbridge and many of their admissions tend to talk about 10% cohort for selection to interview, ie individual's predicted grades in contextual. Just wanted to know where I stand in terms of interview selection. I know I need to get the rest of admission criterias all polished to tiptop conditions.

That 10% of the whole cohort - not just your school.

Which one? Cambridge or Oxford?
And which course?
No point being vague, you can't apply to both

Thanks, I was under the impression 10% per school, which makes no sense to me

No University would select applicants on the basis of how anyone else at your school had performed or was predicted.

I'm hoping to apply to Oxbridge and many of their admissions tend to talk about 10% cohort for selection to interview, ie individual's predicted grades in contextual. Just wanted to know where I stand in terms of interview selection. I know I need to get the rest of admission criterias all polished to tiptop conditions.

I've just read the entire medicine admissions policy of Cambridge university, not one mention of taking those who were in the top 10% of their cohort for an interview. If you've found this on a specific college website please let me know which one. I haven't checked the Oxford one yet but I've come back to ask, specifically, where have you got this information from?

I have previously signed up for individual college's admission webinars/talks https://www.undergraduate.study.cam.ac.uk/events-listing

The admission tutors from 2 different colleges of Cambridge mentioned on that they looked at whether students, prior to interview selection, are within 10% cohort, though they never specifically mentioned how and where they get the data from. Thus my original OP of trying to understand if there is a generic way to find out individual performance at school.

As for Oxford, they hold very few webinars , therefore I would not be able to comment/claim they mentioned it before.

Right, so you're asking us what those admissions tutors mean. Have you tried asking them?
I'm sure you could locate their email addresses
https://www.cam.ac.uk/email-and-phone-search?ucam-ref=home-menu

Sorry, that is not my OP question.
My OP is
"Hi I was wondering is there a generic way to understand how I performed within and against my cohort at school based on the predicted grades given to me after my yr 12 exam?"