Please check out the following links for advice on how to approach Question 3 prompts on the AP exam:
From an AP reader's perspective:
http://apcentral.collegeboard.com/apc/members/courses/teachers_corner/17306.html
A link to a list of former Question 3 prompts, so that you know what will be hitting you:
http://www2.westminster.net/faculty/drummond/APQ3.htm
Some sample essays with AP reader responses:
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&sqi=2&ved=0CCUQFjAB&url=http%3A%2F%2Fapcentral.collegeboard.com%2Fapc%2Fmembers%2Frepository%2Fap06_englishlit_formB_samples_q3.pdf&ei=aE5OVMjyLoyZyASE5YKQCA&usg=AFQjCNH4C5iqGPL8aIrSoQXcp_iEpJfJPQ&sig2=wYnCanZ2no9Vul8fkUi8ZQ&bvm=bv.77880786,d.aWw
Once you have looked through these resources and have a sense of what the Question 3 will be like, spend some time skimming through Jane Eyre, rereading important passages, and noting quotations or passages that you think are particularly significant.