firstly i'd actually go ask your teacher. a key part of being successful in the HSC for DT... and any subject rather, is ask what you need. if you ask properly and your teacher is a real one, they will help you as much as possible to get you what you need. but the cradle to grave conspet is how you source materials, where they come from and their impact on the environment. then how your processes during production affect cost/the environment/and the end product. then study on how the product is used once it is in the maket place, how it affects society. and then the grave part is how teh product is disposed of after is it used, and how it reacts with the environment.. a very brief description, but i'd go see your teacher if i were you.
