Grade Thresholds

[Bioshock]

Hey guys can anyone tell me how the cie decides the threshold and how come so many people score A*, like in previous year around 20% candidates scored an A* in Biology!
http://www.cie.org.uk/docs/qualifications/olevel/June 2010 O Level.pdf

 

[monybob]

Hey dis query has already been answered go and chk da thread named NOBODY EVEN BOTHERZZZ u ll find it there