"Student" is certainly part of the simple subject. I believe "each" should also be considered part of the simple subject, making the complete simple subject "each student", but some might disagree.
May I use this bucket?
Student is the simple subject. The subject is who performs the action of the verb.
The simple subject of the sentence is "you".
"It can." In that sentence, the pronoun "it" is the simple subject.
"Natives" is the simple subject.
A simple subject is a thing. If it were talking about a Baseball or a sentence the baseball is the simple subject.
The simple subject in the sentence "Did you find your wallet" is "you."
we
The simple subject in the sentence is "Cherokee."
Plane is the simple subject.
The simple subject is "rehearsals." The simple subject is one word that will directly answer the question Who? or What?
"Cherokee" is the simple subject in that sentence.