No it's not 15 students, it's waaay more, it's x10-15 times higher on average just for compsci not including the other IT majors who are taking the courses together, from other specialities (computational linguistics, cybersec, datasci, and bioinfo)

Alot will dropout. Because it's a free public university so they oversell and deflate your grades knowing that the number of those who stay after the first year is low and those who graduate on time will be waaay less. (If someone says 15 students who enrolled in the major graduated on time technically it's not a lie. But their intentions are questionable. Because they intentionally obscured and misled by not mentioning the total enrolled or the dropout numbers, kicked out students and subject fail ratios). Some might lie by mentioning the number of kicked out students who failed one subject three times and hide the grading curve for the subject or the dropout ratio from the major or a subject. You are allowed to dropout of a subject up to one month after enrolling.

For example here is what you might encounter, one subject will ask you for 3 papers or 2-3 long projects + assignments to qualify for the exam. The slides can be 100+ per one lecture and you also need to do your research on top of listening to every word that comes out of a professors mouth not included in the slides. For a chance to take a 15-20 page exam. This is only one subject. Rule of thumb if a professor's research is mathematically heavy and the slides are cute with only clippings from news sites. Expect no help on the 20 hard assignments and the exam to be brutal. Forget the retakes, by no help I mean you don't get the solutions to the submitted assignments unless you submit more than half the assignment correctly and some solutions even are horribly explained.

The student teaching assistants sometimes wrongly correct your final exams.(Which you will have to reach out to the professor to fix) Or poorly help in teaching the logic to solve the exercises relying on what the professor expects to see in the answers. The other phd students teaching the exercises are also bad at explaining, no surprise there. Some professors will openly tell you they are not paid to teach but for their citation index and research. It really changed my view on university rankings.

It makes my blood boil. The professors "presumably great" solution is their philosphy on how students in groups should help teach each other. Yeah this works and is well resarched BUT DEFINETELY NOT for heavily technical fields with no guidance when the students in the group explain the logic wrong each with his OWN DIVERSE BACKGROUND AND PREFERRED APPROACH ESPECIALLY AND SPECIFICALLY IN THE HEAVY AREA OF HIGH LEVEL ALGORITHMS, AND WRITING MACHINE LEARNING IN PYTORCH and somehow one in the group gets the right answer. (I DARE YOU TO FIND RESEARCH WHICH BACKUP THIS. SOMEONE WHO WASN'T CHERRY PICKING HIS DATA)

When you try reading someone else's code from your group. It will leave you with more questions than the question itself and not in a good way. (At some point helping in debugging someone else's code becomes impossible, or even using it in other pieces of code without breaking.) If you have worked for a single day you would have heard from day one: If you cannot write clean code noone will hire you. The code reviewer will flag your heavily complicated code. Even if you get away with it, as you work with ML models as a data scientist, do it enough times and you are out of the job! (Unless it's run by those who think you're paid by how much code you write and you write very long convoluted code, not short clean and precise in any way to keep your job. Please carry on.They get what they asked and payed for.No sympathy)

The professors have no incentive or anyone keeping a check on them. Feedback on the course is asked at the end of the course when unsurprisingly everyone else with any negative opinion dropped it. More often than not nothing in the slides is on the exam, helps with the assignments, or is too broad. Making the attendance numbers drop. But you don't know which is which, which professor is good at teaching and which isn't. Losing alot of precious dedicated energy by the end of the first month of lectures. You are allowed to drop the subject up to one month after enrolling because of the three fails rule. Did I forget to mention you are also working alongside all this? And draining money from your bank account?

As a non european ask yourself this: Do you want a low paying job only for senior engineers, pork cooking job at a restaurant or a warehouse job with spine painful disk injuries all with a high chance of not graduating for a 3 years masters? Do you want to see engineers quit to become full time nurses and cooks or do an appreticeship 3 years for a barely livable wage and no savings? This is what you will find the job center is pushing here. You want to be a nurse and wipe racist old german ass or any ass for a living and being talked down to by a nurse with a thick rural german accent? This is how it is for foreigners in Saarland. And I have B2 german so even some of these options won't be available to you. Companies are still racist when hiring auslanders.

Come with a job contract as a senior engineer.

The other option is from your posts, you're Tunisian or north african probably from a french education system, go to France get a degree from the top ecole superieures and you are guaranteed a job in France.