Unit 1 relies heavily on nomenclature (naming compounds) and balancing equations. Use the practice questions in the textbook chapters to drill these until they become second nature. If you struggle with stoichiometry early on, Unit 2 will be much harder.
You cannot get the full PDF for free legally, but you can get partial access or affordable alternatives. Chemistry For Queensland Units 1 Amp- 2 Pdf Free Download
You might have found a Reddit thread or a Google Drive link claiming to have the Chemistry for Queensland Units 1 & 2 PDF free download. Be very careful. Unit 1 relies heavily on nomenclature (naming compounds)