Have you considered a modular approach in the comfort of your own home at your own speed, for a fraction of the cost.
I mention it as a couple of the people on my crammer course wanted to get the job done quicker than the integrated school’s timetable would allow them to.
Add the excellent support package from these schools, the crammer courses and a smattering of self discipline, one can have it done in a jiffy.
I am more than happy to endorse BGS as indeed are numerous other successful punters, but it's worth keeping your options open.