How to compose a query, Eloquent Laravel?

Question

Laravel

there are 5 tables in the database (fields in brackets for each, respectively):
groups (id | title);
students(id | firstName | lastName | group_id);
subjects (id | title);
assessments(id | value | student_id | subjects_id);
group_subject(id | group_id | subject_id);
Connections:

class Group extends Model
{
    public function students()
    {
        return $this->belongsToMany(Student::class);
    }

    public function subjects()
    {
        return $this->belongsToMany(Subject::class);
    }
}

class Student extends Model
{
    protected $fillable = ['firstName', 'lastName'];

    public function group()
    {
        return $this->hasOne(Group::class);
    }

    public function assessments()
    {
        return $this->hasMany(Assessment::class);
    }

    public function subjects()
    {
        return $this->belongsToMany(Subject::class, 'assessments', 'student_id', 'subject_id');
    }
}

class Subject extends Model
{
    public function groups()
    {
        return $this->belongsToMany(Group::class);
    }

    public function assessments()
    {
        return $this->hasMany(Assessment::class);
    }

    public function students()
    {
        return $this->belongsToMany(Student::class);
    }
}

class Assessment extends Model
{
    public function subject()
    {
        return $this->belongsTo(Subject::class);
    }

    public function student()
    {
        return $this->belongsTo(Student::class);
    }
}

How can I correctly choose for each student those subjects that also correspond to his group in which he studies, so that there is no such problem that each student has different subjects, even if they are in the same group?

Answer 1

Use Has many through