Sorry if this is a bit too late but it might be useful anyway,
so I did accelerated IPT two years ago in year 10 and got a band 6 in it and what I found to be incredibly useful was getting all the syllabus headings and memorising all the associated subheadings, definitions and course specifications(literally quote them word for word) so I knew what information to put in my short answers. That method assumes that you already know everything there is to know to enough detail to answer a response, as well as allows you to write everything there is to write in your answers to get full marks. Also, get hold of every single paper there is and just do them; the syllabus has barely changed since 2001 so you have around 17 years of Catholic, HSC, Independent and Trial papers; you'll never run out of papers to do.
IPT is pure memorisation and I wouldn't wish this subject on anyone, but you picked it so you might find it more interesting than I did so yeah good luck