GCSE qualifications are taken through AQA

Overview	http://www.aqa.org.uk/qual/gcse/new_science.html
Science	http://www.aqa.org.uk/qual/gcse/newscience/scienceb.html
Additional Science	http://www.aqa.org.uk/qual/gcse/newscience/adscience.html
Biology	http://www.aqa.org.uk/qual/gcse/newscience/biology.html

Advanced level Biology is taken through EDEXCEL

http://www.edexcel.org.uk/quals/gce/biology/adv/9040/

International Baccalaureate

http://www.ibo.org/diploma/curriculum/group4/