The Man Who Knew Infinity (2015)
This one is about math. A-and, I probably lost you all right now. But still, this movie is about Srinivasa Ramanujan, an Indian genius mathematician, who in 1914 went to England to show them Brits, what's what. And he did.
So, how true? Well, the guy has a pretty big wiki page. In addition, I haven't found a decent article on truth of the story, but here's a praising review, which mentions some obvious dramatizations and inconsistencies like Hardy's age and overly simplified racial bigotry.
However, interesting this about that movie is that it really serves only to tell the story of this Indian mathematician. There's no patriotism, no moral in the end. Quite honestly, dramatizations are sorely needed, because, really, it's a movie purely about math, and that's it. So yeah, for anyone with unhealthy love for mathematics - this is surely a must-see movie.