Gaining good skills requires basic knowledge and hands-on experience in word processing and spreadsheet applications. It will NOT be sufficient to study one night just before the exams. There are some small points that might help to increase your success in this course:
Get prepared: In order to be successful, you have to be prepared for the exam. Apply what you have learned from tutorials to different examples.
Participate in workshops: Workshops are a good opportunity to practice your skills, ask your questions and receive immediate feedback from the instructors on-the-go. Follow the examples in the workshops, and redo them later by yourself.
Read additional material: Find books, websites, and videos that provide information about the topics included in this course. However, to go beyond the limits of the course, you can check out the advanced lectures at the bottom of /wiki/spaces/ITETDOCS/pages/28475567 page.