I did my "Umschreibung" with Fahrschule Weber. It is a family business and they do it well. It was a little hard to get the appointments and had to wait a couple of months but once the classes started it went smooth. Timings are flexible as well as on Saturdays so I was able to manage it during a full-time job that too in Corona times! The lady in the office was really helpful. Fahrlehrer used to give a summary at the end of each Fahrstunde and even gave the notes and remarks.