How to filter those Students( equal section with Staffs) to Staffs in Django form

I have no fully experience on Django, mean I am fully a beginner on it. Here is my question ...

my Staff model is:

class Staffs(models.Model):
""" Staff models. """
teacher_of_section = models.ForeignKey(Sections, on_delete=models.CASCADE)

And that of Student model is:

class Students(models.Model):
""" Student models. """
section_name = models.ForeignKey(Sections, on_delete=models.CASCADE)

Lastly the form is:

class AddResultForm(forms.Form):
""" Forms that adds the students Result."""
student_list = []
students = Students.objects.filter(section_name=2)
try:
    for student in students:
        small_student = (student.id, str(student.admin.first_name))
        student_list.append(small_student)
except:
    student_list = []

From those models, I want to filter all students that fulfills

Staffs.teacher_of_section == Students.section_name

I tried to compare the value of the two and set the staff value to filter the students, but it can't work. I know it can work with JQuery, but I want to work with Django only. The form should filter all students that is similar section with Staff and drop the other students - it is many to many relationship of students and staffs. Kindly, I want help for this, it stucks me on the code for the days...