I was wondering where my school fell in terms of achievement compared to the rest of the country to try and further quantify how "privileged" I've been with the education system

Is there anyway I can find a rough percentile of my school? Either from this or more likely; from another method which I've completely overlooked.

Found this from league tables online:
Spoiler:
Show

School average point score: per student | per exam entry
High School A. 910 | 244
High School B. 810 | 235
England average. 728.2 |213.1
Point score defined as: The average number of points netted per pupil at the institution taking AS/A-level or equivalent qualifications (don't really know what this means, don't think its UMS points)

Percentage with 5 A*-C grades at GCSE inc English and Maths
High School A 98% (Selective)
High School B 70%
England average 58.2%

Ive rounded the schools scores in some cases


Thanks