Your test performance is written in your fingers!
Students’ fingertips may hold a clue to their academic test scores, a British study found out. 75 children aged 6-7 at a British elementary school. The subjects’ hands were photocopied and the length of their fingers measured. They checked the children’s math and verbal scores on a standardized British academic exam, then compared the test scores and finger length data, especially the ratio of the length between the children’s index and ring fingers.
The results say that:
Among boys, a low ratio of index finger length to ring finger length was associated with higher math scores. But that ratio wasn’t associated for better or worse with boys’ verbal test scores.
The opposite was true for girls. Among girls, a low ratio of index finger length to ring finger length was linked to better verbal test scores, but not to any patterns in girls’ math test scores. WebMD.com
Further researches, however, are required to prove these findings.
So if you always flunk on your math exams, blame it to your fingers. 
Really? LOL, that’s funny!
Too bad I didn’t know that info back then… I could’ve used that argument with my Math teachers, “But Sir, I blame it on my fingers!”