недоучил

[Zetazet]

Подскажите как перевести "Я плохо написал работу, значит, недоучил что-то"

[Supa Traslata]

failed to learn

[upahill]

I should have prepared better.

[10-4]

it means that I have gaps in my knowledge

[felog]

Option:
I did poorly on/flunked my test because i had not acquired/developed an adequate/sufficient grasp of the subject.

[D-50]

cos I haven't properly revised
or
haven't revised properly, depends on the context

[mahavishnu]

Lack of study

[Clea]

shirk much )

[x-z]

cuzz I've UNDER-lucubrated.

)