if you are above-average with maths, then physics will require very little work, especially if paired with applied maths. Chemistry has significantly more on the course, but can be easier if you are a good rote learner. That being said, you can still get good marks in chemistry without rote learning skills. Coming from someone studying all four of these subjects.
chemistry is harder to get your head around but its way more enjoyable than physics and if ur planning on doing a course in the medical field then chemistry is the choice u want to make for me i do both and i enjoy chemistry more but physics is easier for me as i am good at maths but do both if u can