CPL
RudeNot2
My advice, through bitter experience, is to say don't do the CPL under any circumstances whatsoever: do the ATPL.
The CPL only has nine papers, (compared to the ATPL's 14) but you are actually examined in 13 (yes, thirteen) subjects within those nine papers.
Let me explain the implications of this. Let's take an example, Navigation. In the ATPL, General Navigation and Radio Navigation are two entirely separate papers each with, I suppose, 70 odd questions in the exam for each subject: a total of about 140 questions in which to demonstrate your knowledge. Clearly, it is possible to pass one and fail the other. If you fail one, you only have to revise the one you failed for your next attempt.
CPL Navigation is one paper that embraces both General and Radio Navigation, but you still only get, say 70 questions within which to demonstrate your knowledge; half the number you get in the ATPL. The syllabus for CPL Navigation covers at least 85%, if not more of the ATPL syllabus for both General and Radio Navigation. The only things omitted in the CPL are Polar Stereographic charts and Grid Navigation.
Since the pass mark is 75% in all papers, you don't have to get many questions wrong in the CPL to fail effectively two subjects. This means you will have to revise both for your next attempt.
The Central Question Bank comprises a body of questions of which 85% are perfectly fair and reasonable. The remaining 15% are split equally between complete 'no brainers' and questions that require a depth of understanding far beyond anything that any commercial pilot needs for operational purposes.
Questions are selected for inclusion in the paper by some kind of random selection process, so by sheer luck you can get either several 'no brainers' or several excessively difficult questions. The proportion that these make up of the whole can dramatically alter your chances of passing as the more difficult questions can carry two marks. Remember, 75% is a pass, 74% is a fail.
I think you can see that even if you have genuinely done the work, just a few of those excessively difficult questions could scupper your chances of passing, and then you have to revise the whole of two subjects all over again in order to repeat one paper. I found that this made the CPL far trickier (notice I say trickier, not more difficult) to pass than the ATPL!
Add to this the fact that CPL exams are only held once every eight weeks, while ATPL exams are held every 28 days, but you still have to complete all your passes within six sittings over eighteen months. Actually, the CAA hang onto the exam results for some days before notifying them to candidates, so that you miss the closing date for examination entries for the next examination for subjects you have just attempted. But with ATPL, at least you have the option of taking different subjects at the next available examination date if you wish.
Think carefully before you go for CPL.
Broomstick.