Swearing, sad, yet amazingly good
A Brilliant Young Mind is a compelling drama about a 15 year old mathematician with autism.
I think it would be better for 14 year olds because of some depressing scenes, including an autistic boy cutting himself after being bullied. There is a car crash scene that is very upsetting - more in an emotional way.
Another troubling factor was the swearing. I think it's okay to let pre-teens and teens get used to hearing some language so they don't come across as shocked and confused when it is used, but if you disagree, there are three uses of "f--king" (one by a child), one use of "s--t", and two uses of "dick" (one as an insult).