Please find below links to the AS/A2 Examination Boards. Through these sites you can find specifications, examination dates and some past papers. 

www.ocr.org.uk 

www.aqa.org.uk 

www.edexcel.org.uk 

Please find below a link to the International Baccalaureate website for overall information about the IB as well as the important document already distributed in paper copy for every candidate entitled General Regulations: Diploma Programme for students and their legal guardians.

http://www.ibo.org/documentlibrary/regs_ibworldschools/index.cfm