Hi
If you've already activated the books which are important to the exam, you might just want to do a little more superreading to refamiliarise yourself. A better way is to look at your mind maps, if you made them.
Take breaks as usual - every half hour or so. Listen to the Memory Supercharger. It should help. And I suggest looking at past exam questions and deciding exactly what material it is that you really need to know. For economics, I'm guessing essays, so you'll probably have more choice anyway. See if you can find worked solutions and look through those.
Just suggestions, but I do encourage you to get down to it quickly.
Good luck.
KWLee