The candidate can log in again and continue where they left off, however we intentionally do not stop the timer on aptitude tests if someone closes their browser window. This would allow for people to cheat by closing their window, working out the answer without losing any time, and then logging back in again to answer the question.
The best thing to do therefore is to prevent issues such as the above by ensuring that test candidates use reliable computers with good internet connections, full batteries in laptops and that they are careful not to accidentally click the exit button on their browser.
