ATPL exam marks are NOT of great importance. That's just the way it is. And this is from someone who's passed them less than a year ago and is now looking for the first job in the aviation business.
My CV doesn't mention my marks and I had a 93% average. If these marks would help me find a job, trust me, they'd be on my CV!!!
BTW, every airline recruitment process will have exams that will test your knowledge on Performance, Air Law, etc, anyway.