Your parents are fgts. Yes, good grades are important, but, in the scope of life, your grades earned during school ultimately amount to shit anyway. Here in Australia, the Year 12 certificate is equal to a Cert II. Yes, it is better to have a nice looking Year 12 certificate than to not have one (you need a Year 12 certificate if you want to qualify for Officer training in the military), but, in the end, it really doesn't matter what sort of grades you got in school.