As i mentioned in my post here:
it is very important the traffic school to located as close to Trafikverket office, where your test starts.
In that way, every lecture (körlektion) would be exactly similar as your real test, so you will not pay money to a
school to drive on roads that will not be on the test! On that way, you optimize your money you pay, and maximize
the chances of passing the test.
I recommend the traffic school that is located in the same parking slot with Trafikverket office in Sollentuna (Edsvikens Trafikskola). They are very pedagogical and almost all students pass, if you see their track records. They post results all the week how many passed, almost all pass