I wouldn't get hung up about squeezing every last point out of every qn. The first 30% of marks should be picked up quickly and easily ( so I was told). The last 20% of any qn are the hardest and you may be better moving on to hoovering the early marks than the later ones.
Don't jump into any qn at the deep end. State the obvious - it generally scores.
Read the qn to pick up clues. Words like 'big' 'small' often are hinting at something eg limited experience, size of free assets so pick up on these.
Don't fall into traps like talking about shareholders if the co is a mutual. Or writing about bonuses if its a non-profit office.
If you some reason you get a formula qn, define your symbols clearly. That seems a common omission from candidates.
When you look at past papers, highlight the points you generally miss and try to remember them when you see similar qns. And look out for the remark 'many candidates missed this'. I reckon everyone has 'blindspots' and this may be the best way of reducing yours.
If you are talking about methods, the words simple can be expanded to include calculation/understand & interpret/communicate. Likewise alongside simplicity often comes speed of calculation or cost in terms of computing power and/or skilled resource.
I don't think there's any way to guarantee bonus marks others won't get. It often seems more about exam technique than knowledge.
Sorry there's no magical ingredient from me.
But good luck anyhow.