There is a very wide range of "grammar school entrance exam" courses on offer: In addition to face-to-face courses, there are distance learning courses and combinations of face-to-face and distance learning.
Classroom courses are offered as intensive courses during school vacations or as half-year or full-year courses with 2-4 lessons on Wednesday afternoons or Saturdays.
Some "grammar school entrance examination" courses are not supplementary courses that are completed in the free time of regular school attendance, but full-time school years that teach the subject matter of the school year and also work specifically towards the transfer to a grammar school.
The costs for the different types of "Gymnasium entrance exam" courses vary and depend mainly on the type of course and the number of lessons. The best way to compare costs is to look at the average cost per lesson. These are around CHF 35-45 (as of 2020).
With some providers, the mock or simulation exam is not part of the preparation course, but a separate offer. These providers charge additional costs (from approx. CHF 120).
Provider of preparatory courses for the grammar school entrance exam