Advice for dropping a subject :(

So for A2 I'm currently taking Maths (A at AS) English (A) Physics (B) and Chemistry (C). My plans last year kind of went to **** when I got the C in chemistry because I wanted to go into chemical engineering. I was stuck because I didn't want to give it up but equally I knew I'd get better grades in the other subjects so my general plan was to take all 4 at A2 and apply this year for mechanical engineering, then decline the places if I manage to get the chem grade up, then take a gap year and apply for chemistry. But a few months in and I can't handle the workload, and I don't know what to do. I love chemistry but realistically I can't get it up beyond a B, and I feel like I should drop it and just head towards mech engineering. I don't know I feel like if I dropped physics I could work ridiculously hard and maybe swing an A at chem with a retake but tbh it's a huge risk and I have no idea what to do. To maintain my grades I feel like I need to drop a subject, and ideally it would be english because its not related to my course, but its a high A so... Any advice? Its basically a case of logic vs want. I want to go into chemistry, but it's not the most logical course of action I think