In my opinion, if your school provides a decent number of practice exams, you really don't need to waste your money buying extra materials. If you're set on buying something from NEAP, I would save some money and buy the cheaper version. Note, however, that if you're struggling, I would first, go speak to your teacher to get additional help, second, get a competent tutor, and only when you have exhausted the first two, then would I spend money on these materials.
Many of my friends purchased such items last year, paying for revision lectures and TSFX study programs. Most said they felt as though they were a waste of money and the ones who found it useful said that they regretted purchasing these items because our teacher was a much better resource.
In addition, there are numerous free online resources available including the ATARNotes lectures held throughout the year. I attended a few of these and found the Physics one particularly helpful.
If you need tutoring, I might be able to help. I finished VCE last year.
Hope that all helped! (: