https://www.astarfuture.co.uk/country/study_in_germany.html#:~:text=A%20minimum%20of%203%20A,from%20subjects%20on%20List%20A.
General Requirements for A’ level Students
A minimum of 3 A’ levels at CCC or better is required to study at a German university. These A’ levels must be in independent subjects (eg. Maths and Further Maths count as only one A’ level).
Two of these A’ levels must be from subjects on List A. These subjects include: Languages (not mother-tongue), History, Geography, Politics, Sociology, Government & Politics, Economics, Maths, Biology, Chemistry, Physics and Computer Science.
The third A’ level can be another one from List A or an independent subject on List B. The most common subjects on this list are: Art & Design, Ancient History, Classical Civilisation, Geology, Drama, History of Art, Music, Psychology, Religious Studies, Physical Education and Statistics.
If a subject on this list is deemed dependent, it cannot be considered. Examples would include History of Art for students who also have History, Statistics with Maths, Geology with Geography etc.
There is also a List C that includes a number of subjects that might be accepted if they relate directly to the intended degree programme. Acceptance of these subjects is at the discretion of the individual university. The most common examples include: Business Studies, Design & Technology, Film Studies, Law, Media Studies and Music Technology. The same rule about subject dependency applies, meaning that Business Studies cannot be offered alongside Economics, for example. Law cannot be offered with History, Politics, Sociology or Government & Politics.
We have not included all subjects on List B and C here, nor all of the subject-dependent clashes. However, this summary does cover the most obvious examples.
I obviously don't know how accurate this site is though seems to say what may others do. I image as in UK there will be varriation betwen univerity and courses as to actual requirements.
However I know DH HE course when looking at foreign students looks at different crietia to home grown students - and sometimes require a additional qualification or to pass a test in English in addition to other equilent qualifications.
Based on list above both all my DC have taken or plan to take combination of A-levels that would apparently qualifiy them to attend German University - though in pratcise more than basics would likely be needed.