Hi Damien,
Firstly let me say your English is pretty flipping good, so don't worry about that too much, particularly with your plans to keep learning -very impressive
Secondly, on the schools you have asked about, firstly OAA. OAA, you are right has essentially two offerings, the first is the APP first officer course. This is a full time (integrated) course designed to take you from 0 hours to the frozen ATPL. The course is the main profit centre for OAA and as such they will take anyone on who can meet the funding and has the aptitude (although some will argue this - I'm only trying to state the bare facts) to pass the assessment days. There is plenty of information on here and on OAAs own website if you do a search about what to expect on the assessment days. Therefore a reasonable percentage of those that take the assessment get in - but not all as someone will undoubtedly use this thread to tell you.
Waypoint is Oxfords other offering, which as you correctly note is modular. There is no assessment to get on this course, just the requirement to have 150 hours TT before commencing the flying and the money to pay.
Where OAA and CTC differ is that as I understand it CTC Wings is basically a "pre-selected" scheme whereby acceptance onto that course means you will be given a cadet position with one of CTCs partner airlines. This means that selection is a LOT tougher and I believe the success rate is ridiculously low....a figure of 2% springs to mind...i.e. 98 out of every hundred applicants will be rejected. The ICP scheme was brought out relatively recently to compete more directly against the APP program at Oxford (and the similar schemes run by FTE in Jerez and Cabair). Currently no-one has graduated from this scheme so I don't think you can really gauge how successful this route will be. I would expect that acceptance onto the course rates are similar to Oxfords - but I don't have any direct knowledge here.
So, in short .... the CTC iCP scheme and the OAA APP scheme are very similar and are the two you should compare directly. The CTC wings scheme is effectively a cadetship, offering an excellent (none better?) chance of a job at the end, but is very hard to get into and Waypoint is purely modular.
I hope that helps...
Bon chance!