Got classes of Student, StudentGroup, Pair(double lesson), Mark and a queryset:

class Student(models.Model):
    student_group = models.ForeignKey("StudentGroup", ...)
    ...


class StudentGroup(models.Model):
    ...

class Pair(models.Model):
    pair_time = models.TimeField(...)
    pair_date = models.DateField(...)
    student_group = models.ForeignKey("StudentGroup", ...)
    ...

class Mark(models.Model):
    student = models.ForeignKey("Student", ...)
    pair = models.ForeignKey("Pair", ...)

queryset = (
        Student.objects
        .select_related("student_group")
        .prefetch_related(
            Prefetch(
                "student_group__pairs",
                queryset=(
                    Pair.objects
                    .order_by("-pair_date", "pair_time")
                    .select_related("subject")
                    .prefetch_related(
                        Prefetch(
                            "marks",
                            # This is what I need to filter.
                            queryset=Mark.objects.filter(student_id=**???**),
                            to_attr="student_marks"
                        )
                    )
                    .all()
                ),
                to_attr="student_pairs"
            )
        )
        .all()
    )

I need to filter marks by student_id. How can I do it? Tried F, Q, Subquery, but I can’t get how to use’em.