It is for sure a challenging study program, although most of those who fail do so not in the electrotechnical parts but in the mathematical basics required for this. However, many of those who do not finish their studies simply have the wrong idea of the study before they start. Anyone who expects to find "electronics tinkering at a high level" here is certainly in the wrong place.

If you are looking for something like an entrance test: The initiative "Think-Ing" provides it online (in German): www.think-ing.de.

There is no question that mathematics and physics is the basis for the engineering profession and, logically, also for its study. Of course, it is excellent if you have taken an advanced course in one or even both of these subjects. If not, or if graduation was some time ago, you should definitely attend the preliminary courses offered from the Mid of August each year.

For all (prospective) engineers, whether already in the profession or still studying, English is a 'must'. A substantial part of the technical literature and also many operating manuals for devices are only available in English. In addition, some of the lectures in the elective area are also only available in English. In the EIT program, however, the mandatory area is only in German.

Not necessarily! Apprenticeship and study are fundamentally different and the practical skills that you may acquire in an apprenticeship program are not required in your studies. The only advantage you enjoy if you have previously completed a relevant apprenticeship is that the basic internship and, if applicable, the specialized internship might be waived.

No, the courses are currently free of admission!

Yes, under certain conditions it is possible!
However, you must first have the chairman of the examination board confirm that your certificates are to be recognized as university entrance qualifications. Contact the Chairman of the EIT Examination Board, he can give you detailed information about the recognition procedure. More detailed information can be found in Paragraph 1 of the examination regulations.

All applicants who have obtained a bachelor's degree at another university will be examined individually to determine whether their qualifications are equivalent to those of the bachelor's degree at the University of Duisburg-Essen. This applies equally to graduates of universities and universities of applied sciences. The Chairman of the Examination Board is responsible for the recognition and, if necessary, for the specification of additional achievements to be made.

The university cannot provide any assistance in this regard. Contact the "Agentur für Arbeit" (vulgo employment office), they are helpful in this matter. But also the chambers of industry and commerce can provide addresses and contact persons in the relevant industry.
But you can also simply contact the companies where you would like to do an internship directly and ask about the possibility of doing the internship.

A serious mistake is to take over the learning and preparation behavior from school. Because while everything is repeated over and over again in an organized manner at school, students now have to take care of learning themselves. 'Anyone who succumbs to the temptation here that the university will already take care of their studies will quickly lie on their back and find it difficult to get back up again.'
_{(Quote from: "Ingenieurwissenschaften Deutschland, published by the Institute for Scientific Publications")}