The goal for abstract reasoning is to uncover the pattern and then use that pattern to find out which multiple-choice option is correct.
But there are two main rules to solving abstract reasoning.
Let's look at the following images to illustrate these 3 main rules:

Pointillism Pumpkin by Samantha Geernaert
http://fineartamerica.com/featured/pointillism-pumpkin-samantha-geernaert.html
For the above, we've considered:
Now for the next 2 examples, we will go through:
Example 1

Example 2

Why is it important to know that the pattern can be within an image or within the sequence of images? It gives you another way to see the pattern. For example, if in the exam you're not finding that there's a pattern within the series of images, you can then look in detail for the patterns within the image.
It's really important to have these extra tips so that you can switch views where need be and quickly detect the pattern (whether in the image or within the sequence of images) as opposed to searching for a pattern that may not be there.
The rule of Commonality. In simpler terms, to detect patterns you need to look at what's common in the visual images and what's different or changed . The parts that are different are usually different for a reason so this is the 'trigger' point that indicates there's a pattern there and you need to detect it. This commonality will be demonstrated in later checkpoints but it's good to have this in mind for now.
This concludes the second checkpoint. So let's recap. The first rule is to look at parts of the image – remember the pumpkin? The second rule is that we need to consider the patterns within the image and outside of the image within the sequence and finally, look at what repeating and common and then how things change. This is the trigger point which says 'hey – there's a pattern here'. These three tips should be ones you keep in mind always when approaching abstract reasoning question
Key Rules to remember:
Now it's time to do your assignment.
The below video goes through Q1 of Checkpoint 2. For the remaining questions, go to the next video below.
This video contains worked solutions for Q2 and beyond for Checkpoint 2.