for me, its one thing...
read, read, read
thats it.
I make sure ive covered every dotpoint perfectly, and honestly, any notes, even andrew harvey's arn't enough for me. So i use excel chemistry (the new one), and they cover a lot of things, cept mon and mag, which is use conquerin chem for (the old one). All of the secondary dotpoints, ive done myself.
Also wats the most important is question deconstruction. Sum questions have more than one component to them, and the quicker u identify this and work out an appropriate structure for your responce-the better. I used this, it made my responces clearer, and much easier in the last 20mins when u have free time to check your exam. When u achieve this, you know that u cant get anythin but full marks, as you have hit the question head on. I used it and got 100% for my chem short answers in trial, lost 2marks in mc cause i didnt bother chek. lol
but yea, two things, read, cover all the dotpoint, and most important, learn how to attack exam questions/