I can give some advice on the Unit 1 18 markers. A template is quite useful to follow
1)Define, what is market failure and what causes it
2)How regulation/tradable permits/indirect tax/subsidies can affect market failure and how they correct it (with reference to a diagram)
3)A limitation of the chosen method
4)A better alternative
5)What it depends on
6)Brief conclusion
Having huuuge problems with Unit 2 18 markers however, unable to get anything more than 11/18