In the Numerical series part of the aptitude test, your insight into numerical relations are tested. To some extent this insight is determined by talent, but practicing will always increase your ability to solve the questions. In addition to practicing a lot, it is very useful to know what types of patterns are commonly used in aptitude tests.
We have made an overview of the most common types of number series. It is wise to study this overview carefully before you start making the practice exercises. In this way you immediately train yourself to look for the most common patterns. This will make sure you can work a lot faster and you will make less mistakes.