Biological molecules are any molecules that make up living organisms. Here, four classes of macromolecules are the focus: carbohydrates, lipids, proteins (including enzymes) and nucleic acids. You also need a good understanding of the structure and properties of water, and the uses of inorganic ions in organisms. All of these crop up time and time again throughout the course so developing a good understanding early on is very important.
The worksheets are all in Google Docs format. Click the link, click 'file' and then select either 'Add to my Drive' (if you're logged into a Google account) or 'Download as Microsoft Word' (if you're not).