being a study guide whore during the year,
maths: neap smartstudy is really good and quite difficult, a+ is so so but a bit too easy, don't bother with checkpoints because they only consist of past vcaa papers
english: from experience, i've found that insight is the best, followed by cambridge and then neap was the worst, as it simply summarised the text for minimum of two (except the newer red neap ones are a MAJOR improvement from the old ones)
science: for revision, i've found that the a+ and tsfx notes are by far the best (even to the point of being better than the textbook). neap smartstudy is really good for questions, but again i'm not a big fan of a+ because they're often irrelevant or easy