Fillers are a great way to buy time when you speak, to sound natural and to hold the floor. What's more, they are essential to improving your fluency and delivery score on the G.B.C. test.
To understand how to perform in the G.B.C. test, it helps to know what the testers are looking and listening for. The test does not only evaluate your English speaking skills in the traditional sense (i.e. grammar, vocabulary etc.), but also tests you on your performance.