Practise recognising the difference between first-order and second-order rules.
Here’s a first-order rule for two sets. The variable is the type of side (curved v straight):
Here’s a second-order rule for two sets. More than one variable is used (the type of shape, and its location)
You can see how the second-order rule is more complex. Identifying relationships within the questions is an essential skill in Abstract Reasoning.
These are designed to make it more difficult for you to identify what’s important. You might find larger shapes, random shading, or irrelevant images. The important thing is to stay focused on what you’re examining, and ignore obvious distractions.