All A levels are designed in theory to be of a similar level of difficulty. Now that might be a bit debatable in real life, but that's the intention. However, what you PERSONALLY find difficult is going to depend on what your strengths and weaknesses are. I'd be completely unable to handle physics if I had one to one tuition from Stephen Hawking 168 hours a week, nothing else to concentrate on and a brain transplant, but give me English, French, German and Latin and I'm laughing. Only you can tell whether you need to balance arts and sciences or essay writing and practical subjects or whether you want to go totally in just one direction. Other people's opinions on here are interesting and, for the most part, helpful, but they are talking about what is right for THEM. Know yourself first, then choose accordingly.