I have guided pupils through many different grade exams, but I have most experience of LCME (London College of Music Examinations – previously RGT). They offer grades in acoustic, classical, rock, electric or jazz guitar (accredited by the University of West London). I have put pupils collectively through 40+ exams now, and all pupils have passed with either merit or distinction. The LCME syllabus is very well balanced – a strong emphasis on creativity and playing by ear, but also some great well-known songs to perform too.
I have some experience with Trinity Rock&Pop Guitar and Bass, plus Rock School electric and acoustic exams as well. If you have already done some of these exams with another tutor, I could continue those with you if you preferred.