Aptitude tests can typically be grouped according to the type of cognitive ability they measure:
Fluid intelligence: the ability to think and reason abstractly, effectively solve problems and think strategically. It’s more commonly known as ‘street smarts’ or the ability to ‘quickly think on your feet’. An example of what employers can learn from your fluid intelligence is your suitability for the role for which you are applying
Crystallised intelligence: the ability to learn from past experiences and to apply this learning to work-related situations. Work situations that require crystallised intelligence include producing and analysing written reports, comprehending work instructions, using numbers as a tool to make effective decisions, etc.