For those who have been through the process, do you think the content is easy to forget if not practised? Should I leave it all until I start my training?
Exactly! The content of the 14 subjects is not that much of an academic challenge but it's very extensive and if not practiced/reviewed on a regular basis it's hard to recall. That's the main reason why the exams are commonly split into several sittings, to divide the huge chunk into small little pieces. I'd say enjoy the summer and as you said leave until it starts!