Dropping a subject

I’m doing 4 a levels: maths, fm , physics and econ. I’m thinking of dropping physics to focus on econ and adding EPQ. I really dont find enjoyment doing physics but I would sit for hours reading econ related stuff. The problem is I’m quite good at physics and it would be my back up grade if I dont do good in econ. My last econ assessment didnt go quite well as I struggled with time management. Still I want to do econ in top unis like lse or oxbridge so I dont think physics isnt quite useful. Should I drop it?