For each row in the list, on the left you have a number that identifies a question in the current
test session, on the right a number that identifies the corresponding question in the pool of available questions. I don't think that master exam softare provides a way to "cherry pick" questions and create a customized session and neither a way to select just some topics, but other test engines do.
Btw, I'm not sure you have posted in the right forum ;-)