Many people are overwhelmed by the stressful nature of the Wonderlic test. To help you reduce any stress, you need to take the time to prepare in full ahead of the assessment day.
This means you should look to establish what your base score line needs to be, what types of questions could be asked, and how you plan to answer as many questions as possible in such a short timeframe.
The more preparation you do, the easier the Wonderlic test will become.