I haven't seen it in a way long time - but I recall Stand and Deliver (based on a true story) as being a powerful movie showing the insidious power of discrimination and the even greater power of a teacher whose students learn to reject limitations others try to impose. It is not a fun kid movie - but I recall it as uplifting.

Not sure about age range - but I tend to stretch a bit when a movie is based on fact and depicts things my kid is asking about.

[ETA - I wonder what Jaime Escalante would have thought about common core math .....]