Re: Uchikaiten Sankyo
If you're expected to know it for your test then it's entirely reasonable to grab a more senior student or your instructor after class and ask if they have a moment to show you. The worse thing that could possibly happen is they'll say not today, they're in a hurry. No loss.
In my experience it's MUCH easier to understand by having someone show you slowly than by trying to explain in words. Plus if your instructor has any specific preferences they can show you.