There could be many reasons but the most common ones are lack of complete documentation and weak financial proof.
Definitely, you are allowed to apply again. Just ensure that you have properly dealt with the errors that are pointed out in your rejection letter.
Not required for master’s programs. Most masters programs are in English. But the fact is that basic German helps in daily communication and part-time employment.
It depends on the appointment availability and is usually between 6 and 12 weeks.




