Please revise your display name to meet the JavaRanch Naming Policy. To maintain the friendly atmosphere here at the ranch, we like folks to use real (or at least real-looking) names, with a first and a last name.
If you want a challenge then 1.5 is definitly the good choice. At least there are some good resources to help you study now, such as the Book by Sierra and Bates and (ahem) my own TigerTamer Book and mock exams. YOu can see a sample sixty questions from my database with the link at the end of this post.