This is the 6472nd most frequent Portuguese word.
ev
"Ev" is not a standard word in Portuguese.
The word 'em' in this sentence indicates 'in' and provides context for the prepositional phrase connected to 'cada desafio' (each challenge).
Eu sempre tento me superar em cada desafio.
I always try to surpass myself in every challenge.
The word 'em' here indicates the context or situation within which the action 'resolver problemas' (solving problems) happens.
A rapidez em resolver problemas é uma habilidade valiosa.
Speed in solving problems is a valuable skill.
The word 'em' in this sentence is used to signal the focus or domain of the investment, which is 'educação' (education).