Motivation does not equate to enjoyment.
If you didn't like a subject at school and therefore didn't do well at it, I would suspect that ATPL subject would be harder than they would to someone who, like me, did enjoy Maths and Physics, got a degree in each and found a lot of the groundschool straightforward. However, the subjects which I didn't do well in, like Ops, were because I had no interest in it (it's mostly irrelevant for rotary).
I'm talking about intrinsic understanding rather than purely memorising the Bristol question bank. And don't deny it; we've all done it.
Cheers
Whirls