Hi,
As I am doing my GCSE exams next year, I have chosen my options. Personally, I chose Geography, Art and RS as well as the English's, Maths and Triple Science. I would advise you to do the subject YOU currently ENJOY. This is the main reason for choosing subjects, as if you don't like them why would you want to learn MORE about them.
In geography, it is quite interesting as you learn about various things such as how the earth was formed and things like volcanoes work. I really enjoy RS (also known as RE) as you get to know different views on debatable topics such as abortions and murder. People are often put off by taking RS/RE as they think its all about religion, but thats not the case entirely.
At the end of the day, take the subject you ENJOY and ask your teachers for what the GCSE COURSE will be like. This is because different exam boards (such as AQA, Edexel etc.) do slightly different things.
Hope this helped x