Should I take four A levels and One AS Level?

The university I am aiming for requires me to take physics, chemistry, mathematics as a compulsory subject. Taking computer science increases my chance of getting into the university. I have been interested in another course called Media studies. I want to do AS Level in Media studies. Should I do it or not? My grades are usually A and above (8s or 9s). I'm currently taking 8 IGCSE subjects. I have extra curricular activities as well. Would it be too stress for me?