The internship has to be at least 6 weeks and at most 12 weeks.
Yes, there is a guide for international students from the HU Berlin.
Yes, please register directly with the lecturers for the courses and exams and ask them to either send Mrs. Kaboub (email@example.com) your grades or issue you a transcript (after you took the exam) that you forward to her, as all the grades are booked in AGNES at HU. To enroll at the other universities, see the questions under Multiple Enrollment.
After you enrolled at HU Berlin for the MSc. Statistics program, you can also enroll at FU and TU Berlin. This does not lead to additional fees and should be done to take courses at FU or TU.
At FU, it is called “concurrent enrollment” (“Mehrfachimmatrikulation”). Further information can be found on the website of FU Berlin.
At TU, it is called “multiple enrollment” (“Mehrfachimmatrikulation”). Further information can be found on the website of TU Berlin.