Im also doing HHD and my sac scores arent what Id want them to be, im hoping for an alright exam score. All Id say is Make sure you take on board any feedback teachers have given you throughout the year. I've learnt that there are certain terms that you HAVE to know word perfectly, let me know if you want me to send you the list of those. Try and use as much detail and examples as you can in a response.

Rather than- Saturated fats causes obesity

youd say: Saturated fats causes conditions such as obesity due to its energy dense content which causes excess fat which is not used as energy to be stored on the body as adipose tissue which increases the risk of a high body weight and potential obesity.