There are plenty of threads that cover this topic. Try a quick forum search. However, as a rule of thumb, the ATPL exams are compared by many to GCSE's in terms of difficulty. In fact, someone here recently compared passing the ATPL exams to passing 14 GCSE's rather than equating the ATPL's to a degree. I've not sat them personally, so I guess there are many more people here more qualified to comment.
As we don’t know anything about you or your academic ability (just under is a bit vague), it’s difficult to say – so I won’t comment there. All I’ll say is, I hope you succeed – for your parents’ sake as much as your own. It’s a wonderful gesture what your parents have made. Do lots of research and find out as much as you can about the training. Maybe visit a few schools.
Good luck.
S.