I got in last year and was in the same position as you. I transfered from a very low ranked school (400+) and it wasn't even on the rankings before 2015 because it never got any band 6's.. anyways here's my 2 cents.
As others have said Abstract is like an IQ test, for maths just brush up on 5.3 topics, for Reading I guess just be good at analytical skills, they tend to slide poems and all that.
For academic awards, I attached ICAS, AMC High Distinctions and Distinctions, I also got Distinction in Australian History, Geography Competition and Rio Tinto big Science Competition. I played Football too outside of school and I attached that to my application. Good luck and I hope you get in.