Final answer:
Joseph most likely has an Intellectual Disability, indicated by his need for assistance with daily tasks and struggles in school.
Step-by-step explanation:
Twelve-year-old Joseph most likely has an Intellectual Disability. This condition is characterized by significant limitations both in intellectual functioning (such as learning, problem solving, judgement) and in adaptive behavior, which covers a range of everyday social and practical skills. This diagnosis is consistent with Joseph's need for help with everyday tasks such as feeding and bathing, as well as his struggles in school. Intellectual disabilities can also occur with other conditions; for instance, children with autism spectrum disorder (ASD) may also present with intellectual disabilities, although Joseph's symptoms as stated do not specifically suggest ASD.