A fluent speaker of English would not ask "Do you know + infinitive" " when asking about the "ability" to do something.
Do you know how to read? Do you know how to ski? Do you know how to play dominoes?
"Do you know to read" (Você sabe ler) looks like a literal translation from Portuguese.
I believe it should be 'a ler' and not "lem"
"Eu tento aprender a ler e escrever"
But then again, what do I know, I'm just at level 9 =)