Go for what you enjoy most, I know that sounds cheesy but it's true. Further maths, maths and Physics will help you through a Engineering degree. Only go for Chemistry if you enjoy it, not if you feel you should take it. Likewise with English, don't just take it to show you are a well rounded student. This isn't America, so it admission tutors are looking for passionate students who they know will excel in their subject.
To show you have a life other than just your subjects, maybe you could take up a hobby?