After Victor leaves school, running to the library to get french books so he can help Teresa learn french. He wanted to impress her only because he liked her so now hes going to help her learn french when he really doesn't know french.
Now Victor is With Teresa helping her learn french, since she thinks he knows french. He has book to 'help' her but he probably is also using it for him to, so he can still impress her.
He now has taught Teresa some french and having her repeat it to him. There he had her say "Hello, I'm Teresa" as her first and simple thing to know how to say in french.