I have heard this word in other languages. It refers (in the bad sense) to those persons who are really hard working, study a lot, memorize, but in fact do not have the intelligence knack. They are not wise, but hardworking.
Such a person might be called a grind:-
Informal A student who works or studies excessively.
[American Heritage Dictionary via The Free Dictionary].
This doesn't invariably mean someone not particularly bright, but it carries that implication (they are grinding facts into their head, mechanically and without inspiration).
"Book Smart" ~ having a lot of academic knowledge learned from books and studying, but not necessarily knowing much about people and living in the real world
You might mean "Dweeb".
Know about it here.