Go to this class site for a good example of a pre-HL biology course at International School of the Gothenburg Region in Sweden. The text used for the class is one previously used at WFS for 8th grade, but you'll find the written summaries a good review for what you might not remember and a good gap-filler for those topics you perhaps have never seen before. A quick background check-in is possible via the unit quizzes - one each on Cell Biology, Genetics, Evolution, Human Body, Ecology.