I wish you all the best.
We lived 6 years now here but need to consider US state Department involved and file law suits against certain government officials here in Cham, ZG.
We had one son in the Sekundarschule in Cham. They have in some courses different levels, called "Niveaukurse" here. When a kid moves up from level B to A, in this case it was in French, the normal case and government rules are that this kid is getting a so called "Liftkurs". This is a side class/course to make up for the knowledge difference compared to the other kids already in Level A.
In the case of my son, this course was denied by the school and city principle with no explanation or reasoning. I filed then an official complaint according to the guidance of the city council against the principle as in our opinion this is completely against the model of this Levels A and B in multiple classes (Kooperative Oberstufe). The answer was not satisfying as the city school president (which hired the principle) would not give a reason either for the decision.
Now, since I did not agree with the principle of Cham, he involved the KESB, which is a Agency under scrutiny similar to social services where kids are getting displaced, usually kids that are beaten, abused etc. It is not clear righ now but they try to cause problems, in my opinion a pure act of revenve, and try to convince the state government that my appeal to their decision is causing my son psychological damage and he suffers in school. Interestingly my son has average and stable grades and he even got an internship starting this summer after he finishes the Sekundarschule.
If you come here and want your kids to go to public schools, it is at your own risks. Zug writes on the own website, that Zug is regarded as having one of the best schools in the world. If you ask the government how they measure that, there is no answer. I did ask so I know that there is now answer.
Paper takes everything. I wouls say it is OK to send the kids to primary schools. After that, private schools are the solution, we have seen the difference with our three boys here.
Anyway, if you can, stay away from Zug. They are completely out of money and the schools are getting worse. I am convinced that they did not provide that course to my son for financial reasons but never could disclose that because it is not in line with the school model and if a father complains, then the revenge is to get the KESB involved. This, before the case is even over. Sick People here in Cham, very sick, what a scandal actually for Zug and supposedly the best Schools in the world..