Rocket Science 2007 one on netflix

Hal is a 15-year-old high-school student with a minor yet socially alienating (and painful) disability: he stutters uncontrollably. Determined to work through the problem, Hal opts for an extreme route – he joins the school debating team, which sends him on a headfirst plunge into breakneck speech competitions and offers a much-needed boost toward correcting the problem.