Assessment centres can be very popular with companies. As recruiters, we are not able to bypass the tests for you. Every company has its own rules. However, we can help you get over your concerns and fears.
The aim of an assessment centre is to find out how applicants behave in situations that are typical for their profession. The most frequently measured aspects are communication, conflict and cooperation skills or assertiveness. Ideally, an assessment centre provides useful information on how you stand in your own career progression.
Try the following free online test on http://www.psychomeda.de/online-tests/persoenlichkeitstest.html.