HGG Community Forums

So i have my chemistry GCSE exam tomorrow (paper 2) and i am really struggling with a few particular topics:

-concentration (ie volume and how to figure out how concentrated something is)
-moles (such as how they link to concentration and how to figure out how many moles are in a solution)
-the harbour process (such as how it works and which way, either the left or right, it moves depending on pressure and temperature)
-polymers (such as what carboxylic, ethanol, and alcohol polymers look like and how to remember them)

if anyone on here can give any help to any of these topics it would be greatly appreciated!
i know a lot of you are good with genetics hence why i think there could be some chemists on here. :)

TIA
:D