Bio, Chem and Physics are all excellent subjects! Which ones you do will depend on which jobs you want to do, and what you want to do at uni. For instance, if you want to do any sort of engineering then physics is crucial, and if you want to do medicine then you must do chemistry. Think about what you want to do in life, then look at uni websites or ask your teachers, who can tell you what subjects you’ll need to do that. At the same time, try to keep your options open so you’ve still got options if you change your mind in a year or two.