I'm curious as to how your one year GCSE courses work?
Anyway, I haven't taken Applied Business but those who have in my year have got a lot of coursework. I'm taking both German and French, though, and it really depends on your strengths in languages whether you want to take German next year. Obviously, you're currently doing well in French, and since French and German have the same types of exams (the only difference being the language). So, I think German might be better.
Sadly, I can't really say anything about PE. I'm biased against it as I hate PE.
do you have any idea what you want to do at uni yet?
German is the most useful out of the three imo.
Don't do PE. It is one of the hardest to get an an A/A* in because, although the theory is easy it only counts for 40%; the practical is worth 60% and its very difficult to get full marks as you have to be good at the sport and the teacher/examiner has to like you to give you a high grade in your 4 practical activities.
I would say do German - it looks better than the other two. There's no point doing PE unless you want to continue it later, and you can do A Level Business Studies without the GCSE.
Currently, I do French AS (took the GCSE in year 10) and GCSE German and it works fine. I'm doing OCR for the GCSE and AQA for the A Level, both of which have no coursework, and it's working fine. The content of GCSE German is so much easier than it was for French.
There are a number of considerations.
You need to think about what you would enjoy because you are unlikely to suceed in a subject that you find boring.
You might also want to try to assess where your academic peak is. In order to aim for your best, it is useful to try to have some idea of the type of discipline that this might be in.
If you can, try to find out details about the assessment method. Applied Business is a vocational qualification and as such there is a lot of coursework. It is also worth bearing in mind that there are written components for GCSE PE as well.
There is a national shortage of people doing at least one language because this is no longer enforced by the government past the age of 14.
If you are interested in applying to ancient universities - especially Oxbridge - PE and vocational subjects are often considered to be unacademic, but this applies to a greater extent at A-level.
I hope this helps. Good luck in making your decision.