Everybody has different ways to study. For me, I would suggest you to make flashcards and study them for an hour; taking a break and then going back to studying for another hour or more if you would like.
As for improving the memory.. it may sound kiddish but I like to come up with phrases. I've always done that and it has been very helpful. For example, say that Chile is the largest exporter for grapes. A phrase to remember this information could be: The grapes are 'chilly'. "Chile", "Chilly."
Overall, studying a lot should help you memorize the materials. Make sure you get enough sleep though, I learned this the hard way a couple of times aha. I wish you luck on the exam on Monday!
