For section 1 and 2 you need to do a practice paper, check your results, and for every question you got wrong you need to go through the question until you fully and completely understand why it is you got it wrong, and why it is that the correct answer is the right one.
There is only one correct answer to these s1 and s2 questions. It is very possible to work these out. Until you understand why you're making the mistakes you are you won't be able to properly improve. Just doing the questions over and over reinforces your inefficient or incorrect thinking patterns and you won't improve.
If you don't understand one of the answers then get someone to explain it to you and work through it with you.
And just as a side note, all reasoning skills you have are skills you have learned at some point, you weren't born able to sit a UMAT test, just able to learn how think rationally. If you have learned bad habits it might be hard to rectify them, but, at least for s1, these skills can be learned by anyone who is getting anywhere near the required ATAR.