I left the page open once and ran out of time on about 10 questions. They stayed in the unused and incomplete columns when I finished the qbank, which probably means that I haven't seen those 10 questions again.
That qbank cumulative analysis is a bit nutty. Its predicted score keeps fluctuating--it changed about 3-4 times in the last month and I haven't even been doing questions on it.
Edit:
Anyone know what's up with their scoring algorithm?