My son ... (not/come) from school yet.

The sentence uses the present perfect tense, which requires the auxiliary verb 'has' for a singular subject ('son') and the past participle of the verb 'come', which is 'come'. Therefore, the correct form is 'hasn't come'. The option 'hasn't came' uses the simple past tense, which is incorrect here. 'Haven't come' is incorrect because the subject is singular. 'Came' is the simple past tense and does not fit the context of an action that started in the past and continues to the present or has relevance to the present.