thanks for sharing your question with us.
if you come with the student visa to Germany and you have a blocked account, the German government will not help you financially. The reason, why the German government wants you to have a blocked account in a bank in Germany and give the proof of that to the German foreigners office, is that you won't need the government's financial help during your study period in Germany. The amount, which you must deposit in the bank is 10.236 Euro, and that is meant to be your expenditure for the first year of your study in Germany. According to BAFöG (Federal Education Promotion Act) of Germany, the current monthly expenditure of a student in Germany is 853 Euro. From this account (10.236 Euro) you will not be able to draw more than 853 Euro per month, unless you have deposited more than 10.236 Euro for the whole year in your account. However, the good thing is that as a student you are allowed to work 120 full days or 240 half days per year beside your study in Germany.
I hope my answer was useful for you and I'll be very pleased if you contact me again with further questions. I'm a member of the MBEON-staff and I‘ll be glad to guide you over a longer period of time. Mbeon is an online consultancy for migrants via the mbeon-app, which you can install on your smartphone for free. Download it via App Store or Google Play Store. You'll find me In the mbeon-app under my name „München, Herr Noori“ and get confidential one-to-one advice in a safe virtual room where nobody can wiretap messages. Further information: www.mbeon.de
With kind regards,