In case you have to apply for visa, you should contact the German Embassy or a German Consulate. There you will be informed about the requirements you have to meet.
In some countries you will be requested to prove that you have knowledge of German already. Besides that it may be requested that you pay your language course(s) in advance. If a visa is granted, you will have to attend classes regularly. Please note that you have to sign up for 20 hours per week at least.
One of the many requirements for the granting of a student visa is the school enrolment confirmation. TANDEM Köln will send you this confirmation upon receipt of your enrolment and the total course fee.
TANDEM Köln cannot guarantee the granting of a student visa or in any way influence the outcome or duration of your visa application. In case a visa will not be granted, please send us a copy of the negative reply given by the Embassy. Then we will refund the amount paid in advance according to our terms and conditions.
Addresses of all German Embassies:
http://www.auswaertiges-amt.de/DE/AAmt/Auslandsvertretungen/Uebersicht_node.html
Information for Students:
http://www.studentenwerke.de
Information concerning the blocked bank account for foreign students (Deutsche Bank):
https://www.deutsche-bank.de/pfb/content/privatkunden/konto_international-students-en.html