Oral and written communication is essential, because you'll likely prepare reports for your superiors, clients and customers, and you'll answer queries from visitors. Basic mathematical skills are also essential so you can calculate areas, circumferences and volume. Another important skill you need to have is to be able to understand instructions sent to you. These could be in the form of diagrams, schedules and written reports. Prepare to answer questions regarding these skills, because you need them to perform your duties effectively.