How difficult is Intro to biology?

In my college Intro to Biology is a step below General Biology 1, did you personally find it to be difficult?
I took Bio in HS and was pretty average 78% or so, didn’t study or take anything seriously, half-as*ed homework and assignments.
I know what I want to do now and am willing to put my best into school, especially since I am paying. But what was you personal experience with that class?