Welcome to Pprune
13375p34k – not bad for a first post!
Like many theory exams, the ATPLs are probably as big a test of motivation as ability. So yes, if you are not motivated to study, you will certainly find them harder.
But – I was highly motivated, and some sections of General Nav and Instruments (Gyros in particular) had me banging my head on the wall and losing the will to live. It wasn’t for the lack of trying, I just couldn’t get some of it into my head. (Still managed 98% in General Nav exam though.)
So no, I don’t agree with your rather simplistic assertion
Discuss.