The general requirements for acceptance onto the study programmes can be found on the pages of the particular majors. Admission is only possible for the winter semester - thus you cannot apply for the summer term.
Changing universities, associated with applying for a higher semester, is possible for the summer term (application deadline: January 15th). It requires prior clarification of how earlier course credits justify a classification in a higher semester. The success of such an application also depends on whether free study places are available. Hence, timely contact with the person responsible for your profile is recommended. [Contact]
As of winter semester 2011/2012, there is an application of admission for top athletes at the University of Tübingen. For majors with numerus clausus, the so-called “top athlete quota” was introduced. You will find information on this under top athletes support.