How to find VOD and materials for the Sejong Institute 1A course?

Hello, I recently registered for the Sejong Institute's 1A Korean course, but I'm having quite a bit of trouble navigating the site. I'm especially unsure where to find the VOD and learning materials for the 1A course. I decided to start again from 1A after doing an internship in Korea for a few months. I studied on my own with textbooks, but I want to solidify my basics. I already know Hangul well, so I didn't apply for the beginner course. Currently, the most confusing part for me is the difference between the NURI portal and the general website. I would like to resolve this issue with your help. Does anyone know what I should do? Thank you!