It really depends on how your professor teaches it. If you're bored, you can start memorizing structures of amino acids, simple sugars, lipids, and nucleotides. 4+ professors at my school made sure students learn them. My class had little math practice, so stuff like enzyme inhibition graphs were challenging, but the other professor at my school loved math and made it more of a math class (you drink antifreeze by accident, how much whisky do you drink to save yourself was one question I remember). There were some mechanisms I remember learning like RNAse A, which took practice. I'm not sure about your school, but mine taught biochem 1 as the structure and properties of proteins, carbs, fats, and DNA,with a few mechanisms, where biochem 2 actually taught metabolism and all those pathways.
I thought biochem was easier than orgo imo.
EDIT: I also remember the huge emphasis on hw, ungraded. Practicing concepts, drawing, and math from the book is one way to go.
It was all much more detail-oriented for us, like learning how very specific enzymes work. Like one of the mechanisms we needed to know was how in serine proteases, an aspartate residue stabilizes a histidine residue so that it can deprotonate a serine residue, and the serine then acts as a nucleophile and attacks the substrate. So it really does vary depending on where you take it.
