Of crucial importance is what you are good at. Do not worry about anything else, other than gaining the highest possible grades that your potential allows, in order to demonstrate the highest academic skill possible, and if necessary to allow you to progress to university to study one of those subjects that you enjoy. If you fail to achieve results through doing the wrong subjects, you fail both on the aviation career potential, and the backup career options are diminished.
You are correct that there is another thread, with which this will probably be later merged.