To be honest, my advice for you is to take Higher Biology and Higher Chemistry, then crash Higher Physics in your sixth year if you are staying on. I did Higher Human Biology and went on to do Advanced Higher Biology and while I won't say it's been a fun year, it's definitely worth it. I didn't do chemistry at standard grade so ended up crashing both chem and physics and much prefered chemistry. I hope you can try and change classes regarding chemistry, otherwise, don't let the teacher put you off a wonderful subject! Higher physics isn't to difficult to crash but I did higher maths before I did physics, and I was doing Adv higher maths so my experience is different from what yours may be like. Hope it helps.