Well, here are some "MUST DO" topics for Paper 2.
ALL Electrolysis topics including
Definition
What an electric current is
Electrolyte and non-electrolyte expts.
molten (probably only if involving moles, coulombs and Faradays)
Aluminium (cryolite, electrode replacement)
Aqueous (concentrating on NaCl - diaphragm cell), CuSO4 and H2SO4.
Tests for all products and observations in all cells
Ionic half equations
Blast furnace
Raw materials (not carbon)
Know all 5 reactions in detail
Obviously uses of aluminium and iron, and why different methods used for their extraction.
Crude Oil
Process of Separation in detail
Fraction order, names, uses, properties
Cracking
Polymers (prep, differences,
Four methods of making salts
Anything related to Environment (acid rain, biodegradability, climate change)
More to be added. Your suggestions and comments are welcomed