Can you tell me in Farsta which  places you went  for uppkörning ?
Sköndal. ?
Tyresö.    ?
Skarpnäck  ?
Haninge  ?
 
Tyresö I think. We took 73
 
No worries! Hope you can pass next time... For information on driving in a roundabout, you can follow the official instructions from the Transportstyrelsen www.youtube.com/watch?v=ThtJedtF-H8. This is the ultimate clear info I have ever found. Recommend that not only watch the video, but also think about all the consequences. In addition, you can follow a practical video  www.youtube.com/watch?v=KCfygHCIL-o&t=311s 
 However, the issue is getting the next available slot within the time frame.
Hope for the best!