To link to a Youtube video without embedding, insert


into the URL when you link it (or just edit the post source code after creating the links).

Hide the class total grade in Grades > Setup, then scroll down to the final grade and choose Edit > Hide.

Hide the final exam grade by going to the Final Exam assignment, then Edit Settings, scroll down to the Review Options section and uncheck the Mark box (uncheck Whether Correct, and Right Answer while you're at it).