Sounds great
What do you want to do after A levels? Bear in mind that some Biology (or related) degrees actually require Chemistry over Biology - make sure the courses you are interested in will accept your A level combination. If you're not sure, I would advise swapping Biology for Chemistry just because it keeps more options open
I would say that all your subjects are worthwhile and enjoyable! Maths and Further Maths are really highly valued by universities and employers, and keep open options such as Maths, Physics, Economics, Finance, etc. degrees. Maths should be fairly simple compared to Further Maths and so you shouldn't have too much work - in fact you may want to consider taking an additional A level since a few universities only consider the combination of Maths and Further Maths as a single subject because Further Maths makes Maths so much easier.
(chemistry... chemistry... chemistry... )Languages are also incredibly useful and valued. I did French AS and really enjoyed it - it was the only subject where chatting for the whole lesson about what you did at the weekend was encouraged! It was also a nice balance to my more science-y subjects
Biology is really interesting too
You get to do lots more practicals than at GCSE and the theory is explained to you much more, so you really understand what is going on which is nice
As mentioned earlier, Chemistry would probably keep a few more options open, but Biology is still a highly respected and valued subject