Nodeschool Redesign (Lesson Content)

I'm in the process of finishing a 'noob friendly' redesign for nodeschool.io.

I stuck to thick borders, thick fonts, and a burst of color to give the site a playful edge without taking away from the purpose of the content.

What i'm trying to figure out for the UX is if the 'Core Concepts' and 'Electives' should switch the content below or if all the content should be listed, but 'Electives' would scrollTo() the 'Electives' content below the 'Core Concepts' content.

Your thoughts?