Why I'm in this forum, I'm not sure.
BUT:
I've heard it's not any harder, really. It's actually probably easier, because it's not as "nit-picky" as figuring out how to synthesize a compound, calculate the force acting on an object, or dealing with any of the other garbage-type hoops that undergrad forces us to jump through.
But, like most others have said: the amount of material is daunting, and might make it seem a little harder just because you're worried about keeping it all straight. And you're constantly being reminding of how little time you have to do so.
I think taking it all in many small, concentrated doses will make it more manageable. Such as studying full-force for half-an-hour, taking a 5-10 minute break, then going back and studying some more. Then take a few larger breaks after larger spans of time. And (although by now you should've figured it out) knowing how you learn/remember best is helpful, and cuts down on a lot of wasted, inefficiently used time.