The biggest improvement will come from Abstract Reasoning practice. Familiarity is the important here. One can boost confidence and correct responses to Verbal Reasoning, Quantitative Reasoning and Decision Analysis, but by practising more and more with Abstract Reasoning questions will improve your ability to recognise patterns more effectively and quickly.
The reasons for this are two-fold:
Having gone through hundreds of patterns which make up the rules, you are primed to recognise more patterns. This will give you the edge on your peers, who may not see the patterns quicker than you. Also, finding patterns quicker gives you more time to find other more complex rules as well as building momentum.
With practice, you begin to become an expert in Abstract Reasoning. When you see a square, you know what types of rules to look for. All squares are four-sided, equal-sided, straight-sided, have right-angles, have many planes of symmetry, etc. When you see arrows, you know that direction or where the arrows are pointing could be major factor in the rule making. And thus, your ability to recognise what and where to look for patterns becomes very efficient and a powerful skill.