There is a world of difference between the various ways of earning a living in aviation. To make a sensible decision about which route to take, you need to learn as much as you can about the jobs that may be available to you. Always remember that it is not about the aeroplane you fly, it's about the job satisfaction you get from flying it.
If you wish to consider the military - a very attractive option - you need to understand that a fundamental tenet of the job is that you may get shot at and killed in the process of completing your task. You must also understand that, for the period of your service, you must subjugate your personal point of view to the needs of the government of the day.
With commercial aviation, remember that there are many more ways of earning a living than by flying an airliner. Far too many wannabes these days are blinkered in their pursuit of the right-hand seat in a 737 and forget that there is a great deal more fun and satisfaction to be had flying (for example) air taxis, freight or in corporate aviation. Don't be in a rush to get to 747s and longhaul flying - unless you are a passionate fan of Sudoku, crosswords and jetlag. There is plenty of time for that...
If you decide that civilian aviation is for you, you must decide not only what your target jobs may be, but how you intend to get there. There are few sponsorships left these days, though the CTC and similar schemes allow you to defer the costs of training until you are employed - assuming you are indeed employed at the end of your training. Should you not be, you may find yourself liable for a very large debt indeed yet with no obvious way of paying it.
Training via the modular route may have less obvious connections with the airlines, but there is no shortage of ex-modular students gaining employment. The debt incurred going this route will be considerably lower than via the integrated route, but on the other hand you will have to find the cash before you take each module.
There is a lot to think about before engaging on the route to professional aviation. This is not Fame Academy; there are no routes which do not require a great deal of hard work and application.
Oh, and ignore The African Dude. You will not require A-level maths for any of these routes to aviation. Your B at GCSE is quite adequate.
Scroggs