What do you do when a candidate doesn’t finish an in-basket?

During the administration the administrator (also stipulated in the user guidelines) informs the candidate that they should try and complete all the items as all the items are rated. It would be unfair if only the completed items are used to calculate the candidate’s score. Some candidates may have rushed through all the items in order to complete them (as instructed) and they may then be penalised for this as opposed to the candidate who completed some of the items but did so thoroughly.