Doing chemistry, biology and English is a good choice if those are the degrees you are trying to decide between. Btw when it comes to chemistry lots of people will tell you not to it saying it is the most difficult a level, however speaking as someone who just finished a level chemistry the new GCSEs really do prepare you for a level chemistry. There is no longer a massive jump between GCSE and a level. I did maths chemsitry and biology and I would say chemistry was the easiest overall. I struggled with biology more, but with biology if you do lots of exam questions you will be fine.