Ok , here's the thing... when i went to IBCC, they asked me if i could provide them with the scaling method used in grade 9 and 10 (highschool, grade 11 and 12 were not a problem) because they somehow found it very confusing... ... so yea... i've gave them a proper scaling method provided to me by my high school in a sealed envelope along with my grades...
so coming to the point, i think you should ask your local high school/ or examination/school board to provide you with some sort of scaling method that they use, which you can then mail directly to IBCC along with your grades... i strongly advice you do such a thing and they'll hopefully implement these changes while considering your grades.... hope that helps