The teacher's dashboard is quite different from the admin dashboard, the teacher's dashboard displays the total number of student the teacher has, the class the teacher is assigned to and the number of subjects the teacher is to take on.
My students: This can be the total number of student in a class assigned to the teacher.
My class: this is the total number of classes assigned to that teacher. e.g, the teacher can be taking on jss1 and jss2 all together.
My subjects: This is the total number of subjects assigned to the teacher, i.e the teacher can teach different subjects in a single term. e.g mathematics, English language, Physics, etc.