i definitely err toward intelligence being developmental and psychological rather than an innate trait.
to convince me it's genetically inherited i'd first want to see some sort of consensus on what intelligence actually is, and a reasonable theory on how it might be biologically present in an individual. from what i've seen so far all that exists is an abstract concept tacked onto a genetic correlation
oh yeah, i failed all my exams as a kid but am doing ok now as a v/mature student.