Can`t comment on BGS JAR notes but used them for the national Navigation exams a few years back and they were very good.
Used GTS to sit my JAR exams and passed all my exams backed up by fantastic tuition, practise exams and spot on feedback. What you have to remember is that GTS instructors were around in the days when PPSC was the big player in the ground school field, and you will find that between these guys they have launched thousands of airline careers to date.
I can only comment as i have found, and to overlook GTS would be a bad mistake. If at the end of the courses the brain has more capacity to deal with even more questions, then as Red eye states enrol on the BGS online database, but bet you could pass purely on the GTS info!.
Just to add to this, GTS are now tied in with PAT at Bournemouth, which if you didn`t` already know has a fantastic name for modular flight training. So their you have it 2 fantastic organisations all rolled into one. Enjoy the course
