Are these the subjects you enjoy the most and are passionate about? If so, then I’d definitely say keep them. A-levels are challenging and it’s important that you study what you have a genuine interest in!!
You’ve chosen three very well-respected subjects here, and ones which will compliment one another. Maths comes in very useful for both chemistry and economics, and all three show competency with analysis, numbers and logic. French shows that you can also write essays, think qualitatively and have good language/communication skills. So I would say this is a very good combination, oui.
The above post is correct, if you wanted to study physics that is. But if you don’t enjoy it, don’t choose it.
These could get you on a good degree in economics, chemistry and french (I’d recommend further maths for a maths degree) as well as more broad subjects like management, international relations and business. Plus, having french means that you can do a joint course like ‘chemistry with french’ which will help you with jobs.
For keeping your options open, this is definitely a good combination of subjects!! If you have any more questions, I’m happy to help where I can