Potential employers really have little interest in your school exams.
You think!
What will happen is that the "potential employers" will file the application in a "special pile" they use when weeding out applications to provide a shortlist of those they want to call for interview. I have serious doubts you will find a chief pilot who asks his secretary to include applications from those with no educational qualifications at all.
To the original poster. You can obtain GCSE's through correspondance courses as well as nightschool and courses offered by your local education authority. Add this to your list of requirements, because no employer will care about the "unfairness of life."