As roar96 said, you cannot prepare for them. I had the Airbus one; arctic shores. It is basically just catching stupid fireflies. There are three rounds:
1-Repeat a sequence; there are 4 jars Purple(Blueish), Red, Yellow, and Green. They flash in order, for example, Y,Y,G,R,B. Then you need to tap those colours to repeat the sequence.
2-Throwing fruits to a jar to release fireflies. There are two baskets for fruits. In one basket you have a fruit that releases 1firefly. In the other basket, there are two types of fruit which are named superfruits. One fruit does not release any fireflies (bomb fruit) and the other fruit releases 3 (good fruit). However, after every round, the baskets change. So in one round, you have the majority of the fruits as good fruit and in another round, the majority becomes bomb fruit. Pay attention to the proportion of fruits in the superfruit basket.
3-Basically there are 5 or 6 different type of jars. 5,10,25,50,100 something like this, I can't remember the exact numbers. So the idea is, they randomly appear on the screen; say that 10 appeared. After that, there is a ready... on the screen, as soon as it becomes fire you need to click to catapult there. The earlier you click more fireflies you release. If you click when it says ready, the jar is wasted (which is not mentioned in the instructions bit).
I did PWC's game based assessment test, and I was convinced that it was actually assessing people. There were many rounds and also numerical reasoning and the IQ test one where you needed to find the next shape (Don't know what is it called).
However, this test is completely stupid. There are only three rounds. If you screw up in one, you are basically done. On top of this, what is the idea of clicking to screen as fast as possible when fire appears? psychometric test my ass. I understand there are massive numbers of applications but this should not be the way to lower the numbers.
Anyways, good luck!