A tax deduction for your self-education expenses related to your work as an employee is available if you work and study at the same time and can satisfy any of these conditions:
You are upgrading your qualifications for your current employment – for example, upgrading from a Bachelor qualification to a Masters qualification.
You are improving specific skills or knowledge used in your current employment – for example, a course that will allow you to operate more machinery at work.
You are employed as a trainee and you are undertaking a course that forms part of that traineeship – for example, an overseas trained person employed as an intern while doing a bridging course.
You can show that at the time you were working and studying, your course led, or was likely to lead, to an increase in employment income – for example, a teacher who will automatically get a pay increase as a result of completing the course..
CPL -> ATPL is a similar step to Bachelor -> Masters - upgrading your qualification.
Even if you look at it on an exam by exam basis, ATPL Meteorology, for example, increases your job-specific knowledge.