I have been unconditionally admitted in adv llm international tax law, but as I have a toefl score slightly below 100, I have been also admitted to study this presessional course, but I do not know how is it. I suppose I have to approve this course before being able to start the master.

Hi Tax lawyer
congratulations on your acceptance to the program.
Could you please share when did you apply and when have you received the answer.
The office answered couple times how busy they are explaining the delay, and yet there people here on the form who keep receiving their decisions.

Well, I have to wait more than 3 months to receive an answer. I received it last month.
My best wishes for you.