thank you for reaching out the wefugees community.
At first you have to contact the foreign office (Ausländerbehörde) to extend your visa. In the time of coronacrisis this is not the problem.
For a student visa you need minimum Level B 2. Also necessary is an annual budget of 10236 € on a blocked account. Here are more informations; https://www.auswaertiges-amt.de/en/sperrkonto/388600
For free acounselling please contact my colleagues in Heidelberg. You can find the addresses here:
I hope my answers were helpful and I would be very happy if you would contact me again with further questions. I'm a consultant with mbeon and I‘ll be glad to help you over a longer period of time. Mbeon is an online advice for migrants via the mbeon app, which you can install on your smartphone for free. Download it from App Store or Google Play Store. You can find me in the mbeon app and get confidential individual advice in a secure virtual space without other people reading our conversation. Further information: www.mbeon.de.
your mbeon advisor