I gave my English exam (Theory B) in Gent. I say it is better to take English exam even though you know Nederlands b/c there is more time to respond
The question & choices for answer appear on screen in Nederlands. A translator reads out load the question and choices in English. He reads it twice. Typically, this takes 1/2 to 1 minute. The 15 second counter starts after the translation and the correct answer has to be selected within this time. It will advance to next question for all the students together after the end of the time period.