I took the exam last year, and the DBQs/FRQs were not that bad...(and this is coming from someone who HATES writing essays)
The key thing that our teacher stressed was to include as many SPECIFICS as possible...the graders love it when you mention specfic acts, treaties, people, events, etc. This is especially helpful on the DBQs. Look at when some of the documents are dated, and try to incorporate several other events/acts/people during that time period (which ofcourse are relevant to the topic).
Even if you are not a strong writer, it still shows that you know your stuff (which is what they look for)
So in regards to your question, I would definitely make a list of acts/treaties/people, that you have trouble remembering, as you are going through your book. Then the day before the exam, just quickly go thru you list, and you should be fine...
I hope this helps...GOOD LUCK!!!