Forget about your grades for a moment. What are your interests - whether within these subject areas or outside of them? What soft skills do you feel you have - e.g. team-working, communication, problem-solving, etc? Would you prefer a job where you're sat at a desk or moving around more? Would you prefer to rely heavily on computer usage or would you rather be doing something more engaging with your hands? Would you prefer a job that has you interacting with people face-to-face a lot or one where you spend much of your day working alone?