Hello.Nice playing and good luck in your exam. My only thoughts, something that I noticed both visually and hearing, is that your touch is quite heavy, maybe that's just the acoustics of the piano, but there's definitely some parts here where you can get away with using the una corda pedal for more sound / colour. The problem with this piece (not your particular performance) is that it has been heard to death by anybody that knows who Chopin is and so it is much easier to pick up on little things.