Your GCSEs won't matter too much really, but you could take Dance, Performing Arts, PE (if available)... Take the subjects you will do well at. That way you can study at college. I would advise doing either A Levels (if you want to stay in the 6th form) in Dance/Performing Arts/Theatre Studies or do a BTEC National Diploma in Performing Arts at your local FE College. This way you will be spending all your time dancing and performing, and learning more about the business. You can then go on to study dance at a higher education level, and get a degree. (London Contemporary School of Dance is an example, and most places like this will offer scholarships.) Needless to say, you should be dancing as much as you can in your free time- dance schools or Stagecoach, but I expect you are doing that now. And after that, it is just a matter of going to as many auditions as you can, and learning to accept rejection- don't take it personally- just keep going!!! Good luck.