I took Orgo I and II. Orgo I was very interesting and the class average was like 55% I think. Orgo I was only slightly harder that Chem II for me. Orgo II was a boring, horrible class that drained so much of my time. The average was like 35-45%. I passed, that was all that mattered to me.
My advice, do not wait to study anything for Orgo II. If you have the time, do it asap. It is not a class you want to repeat, so just do it right the first time.
I am not trying to scare you. In fact, my orgo I&II were 5 credit courses which are not required for most nursing schools
. Maybe, like a few others said, the health sciences one is less intense.