I'm doing Migration and Empire, Britain and the USA.
Britain and the USA are achievable and semi-interesting whilst Migration and Empire is horrendous.
Personally, for revision I learn the sub-headings for the essays, and then learn KU. Therefore, if the essay questions are horrendous then I at least know an outline.
For example, in my Prelim only one of the questions I done came up and I didn't recognise it, so wrote and made up some stuff on "Why Liberals?" and managed to get 15.
Give it a try.