I find it best to handwrite notes throughout the year and then type them up as it allows me to remember everything I wrote down, have a clean and easy to use lot of notes and also it meant that I could send my notes to younger friends to help them out for when they get to yr 11.
As for stationary - you're overthinking it. Go simple. Get a three subject book for everything but your 3/4s and Maths, get a massive book for maths and just normal excercise books for the 3/4s. The problem with lecture pads, and anything with spirals for that matter, is they decompose like something that decomposes quickly (I didn't do bio); sheets fall out, the cover breaks and it begins to look pretty disorganised. So a 3-subject book for some 1/2s is fine because you don't want to be carrying too much, but for the 3/4s where you will rely on having your notes from term 1 at the end of the year, a book that is unlikely to break is much better.
(Also, ATAR is no indication of organisation level, a friend of mine last year had all his notes in what looked like preparation for a campfire throughout the year, and still got a 99.00. It differs with every person).