I'm going to drama school but I also want to study politics?

is there any actual way id be able to do this? my drama course is worth 3 alevels outright, but I really want to study politics too.

Drama School is a professional theatre training - they dont offer politics as an optional extra.

If you want to study Theatre/Drama plus another subject, look at joint subject degrees at Universities, or courses like Liberal Arts and Combined Honours - but (and this is important) this will be an academic degree and not a 'how to work as an actor in the theatre' course. Work out what you actually want.
Liberal Arts BA | Royal Holloway, University of London
Subject Choices for Combined Honours - Durham University
Combined degrees - Undergraduate - University of Liverpool