Poor lad. I have never ever got 100% in anything, ever!
A bit off-topic but here's an anecdote for you. This poor little lad brings back memories of my life at boarding school when, after the day girls had all been collected by their parents, we were herded back to a classroom to do our prep, no talking allowed, until supper. I would silently cry through the maths homework because I never understood it, it might as well have been greek.
I knew that I would score too low in the next test, which automatically meant being awarded a black mark. Three black marks meant an automatic detention, too many detentions and you lost the next exeat. Detention wasn't too bad really: it usually comprised copying out the 23rd Psalm 100 times or some such thing. Boring but better than being caned. It was the loss of the half day that stung. And all the extra work sent home with me in the long holidays.
Forty years later I was tested and found to have Dyscalculia, the psychologist was laughing when he showed me the chart: my language was up in the top 2%, numeracy was down in special needs. It explained a lot!