are their any apps for teaching adolescent autistic male, social skills, maths, english and what are the overall benefits of an ipad for asd child?

I am trying to create a convincing description of the benefits of an ipad for a child with ASD. With specific details / costings, in order to try and secure grant/funding for purchasing one for my son. He is age 15 has ASD - not in school currently and very poor social skills and a bit deficient in the communicative side (ie: inappropriateness of his approach to other kids /making friends etc.
Please can anybody help?
Many thanks in advance.

iPad

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