You need to get a high school degree, get a better paying job — that’s the mantra of the US education system. But some young refugee and immigrant students run into extra challenges — rules in parts of the US that limit how old you can be in high school. And there’s a debate about whether they’re pushing immigrant students out of school. In the first part of our series, “Brain Gain,” reporter Marnette Federis brings us this story from Modesto, California.