Courses to study in uniWatch
It really depends what you're interested in doing at uni or as a career- because you're taking 2 sciences I presume you want to go down a STEM route of some sort? Common third subjects unis want are Maths, Physics and Psychology however it's not completely unheard of for people to take English Lit. Maybe have a look at some universities and what combinations seem to be most common in the degrees that seem interesting to you. Chemistry and Biology are really good subjects that will leave your options open so I would recommend picking a subject you enjoy. I want to dentistry at uni and most unis only require you to take chemistry and biology then any 3rd subject however more prestigious unis require maths, physics or psychology as a third subject. Hope this helps!