Testing Tips: Suggestions for the Other Essay Questions
Answer the questions which are easiest for you. You don't get any extra credit for answering the questions which you find more difficult.
If the question asks you to select subtopics, pick the ones you know the most about, and make sure you address them in your essay.
Use plenty of historical details in your essay, but be sure to tie them in with your thesis statement. Being able to give the year a certain event took place is generally not as important as being able to clearly explain what the causes and effects of that event were.
Good writing skills are not necessary for the history essays, but they certainly don't hurt.