I would imagine that your teacher would be setting questions in Heinemann, so you'll need to read through all of the information anyway.
If you really want to use the Edrolo textbook, I suggest you read through the content before class, and not treat it as your main textbook.
Using Heinemann should be easy. All bolded words/terminology are VCAA-required, so prioritise understanding what those definitions are, as chances are you'll need to define them in the SAC. Ignore Case Study, ChemFiles; anything that seems extraneous. If you are taking any notes at all, record the information in the highlight box (a picture of it is in the preliminary pages) into your notebook. Read through the Chapter Review summary and go back through the pages to look for the information that explains that dot point, and then write it down in your notes if you need to memorise it.