If you have not followed those classes, don't worry at all. T you can catch up later with those classes, or you need not. But if you have done those classes, especially the last one, belan ta sara, you will find it very easy going. Is the going will be much easier. And youw'll find linkages. You'll begin to see where the story is the same across all of them. Upenisas are the foundation of vedanta. Penitians and vedanta are the same. For example, how vedantsa is useful. Vedanta itselfi defined as vedantanama upanisa per Mana.