Dont go into it thinking that ATPL exams are easier, they are not! However when you study ATPLs you tend to do much much more study not to mention classroom preparation than you do for the PPL so it may seem easier.
You are doing school study and have lots on at the moment that doesn't help. Don't worry about it with study and perseverance you will pass. And in all honesty 90% of the stuff you learn for the ATPL exams you don't need.