The embassy of Germany has stated that those student visa requests which are earlier than 3 months from departure would not be considered. Therefore, I scheduled to set appointment on 20 april. Considering 8 weeks for appointment and 10 weeks for Interview plus 15 days delay during both processes 20 april was good. But from the first email it took 130 days for both processes. Now I just have one months to take visa and arrive in time for my courses at university.