I have been through the specification and the following papers: Jan 2012, Jun 2012, Jan 2013, Jun 2013, Jun 2014, Jun 2015, Jun 2016.
The following things from the specification have never been covered and this is their last chance to cover these things.
Good and bad points of limestone quarrying
Comparing hte good and bad points of limestone vs concrete vs cement
Bioleaching to get copper
Metals as structural materals
The effects of particulates on the environment/health (global dimming and damages lungs)
Comparing cornstarch bags vs plastic bags
The good and bad points of emulsifiers (helps us make mayonaise, ice cream and other things. On the bad side, it makes food look more appetising and people eat more fatty food).