While you're waiting for a spot in one of the ADM201 Study Groups, you are very well advised to go over these free Online Trainings:

(1) Getting Started: Administering Salesforce

(2) Securing Your Salesforce Organization

(3) Managing Users and Troubleshooting User Issues

(4) Getting Started with Managing Data

(5) Getting Started - Using the Sales Cloud

While watching the videos make notes on all the features shown in the trainings. Then sit down and try to re-build everything in your Dev Org.