I'm assuming you are doing your work on a computer, as opposed to paper and pencil question. I would say spend your time going thru all the perldocs available. They are full of example code and good solutions. The difficult part is to know which perldoc to look for, for which question. So spend a few hours just looking thru them, noting which ones contain examples of whatever. Is your teacher not allowing you to use perldoc during a test?

P.S. I'm a big believer now in "open-book" testing. It's more important to know how to "use information" than it is to "memorize information".