Can't say much about Germany but I am familiar with the application process for Swedish higher education.
Although it would help if you gave details of the prospective course you're looking at.
Many European universiy requirements tend to look at forign qualifications though a lense of what is the equivalent qualification level (e.g. GCSE = L2, AS/A-level = L3) rather then per grade level.
For example in Sweden, A GCSE in Physics or other corresponding science was equivalent to their levels of 1,2,3/A,B,C whilst a UK level 3 mathematics qualification was equivalent to their level 4/D. In my case they didn't look at my grades for those subject so long as I had achieved a "Passing Grade". This may of course be different for different nations/universities but generally speaking individual grades are less of a concern than if you were applying domestically to UK universities.
Have a look because if you got GCSEs they may fulfill the Science/mathematics requirements.