Don't understand what these codes mean?
The first 4 numbers stand for the subject code
eg: 9700 stands for biology
The next two digits stand for the year and the series.
eg: s16 would mean May/June series past paper of the year 2016
The next two digits stand for the paper and component code.
eg: 12 would mean Paper 1 Component 2.
In the end 9700_s16_12 would mean Biology Paper 12 from May/June 2016.