Associate Developer Certification Exam

So I have seen a lot of questions asked on this topic. However I have a very specific question.

When I took the practice test, I could only move forward while answering the 32 odd questions.

In the actual exam of 60 questions, can I mark / skip and return to the beginning / jump in the middle to re-answer a question?

Basically want to know if I can only take one pass at the questions because this would become important when we only have 1 min on average to answer each question.