The handling fees for the uni-assist application can be read in their regulation of fees .
Visiting a course (except M-Kurs) at Preparatory School/Studienkolleg and taking the admissions and assessment test are free of charge.
You will have to pay a semester fee  each semester of currently about 300€.This is not an enrollment fee, but represents a contribution to the “Studentenwerk” Berlin and functions as a valid ticket for the Berlin public transportation system (BVG and S-Bahn).
Please only come to Germany if financing for your studies can be ensured! Employment for students in the “Studienkolleg” is limited to holiday periods and is usually inadequate to finance university studies and the corresponding living costs. For your stay in Berlin, you will require approx. 600€ per month.