How do I use the scope resolution operator for a nested class inside a template class?

template <typename T>
    class School{
     public:
    class Student{
     public:
     Student & operator++();
     Student operator++(int);
               
}
}

Assuming I have this in my header file, how would I use the scope resolution operator to for an hpp file? I have tried this but the result were an expected initializer before & token

template <class T>
T School<T> :: Student& Student:: operator++()
{

}