The ABRSM (associated boards of the royal schools of music) they don't do e. guitar but here are the requirements for grade one scales wise for classical, it can't be that different (then again grade one electric keyboard is like a million times easier than grade one piano):
Scales: in the following keys (minors in harmonic form only, with right-hand fingering i.m.:
C, F, G majors; A, D minors (one octave) fairly easy.
Chromatic Scale: starting on G (one octave), with right-hand fingering i.m. (really easy)
Arpeggios: the common chords of the following keys: (annoying)
C, G majors; A, D minors (one octave) (slightly weird)
you'll also have to do three vageuly cantrasting pieces. A few if my friends did exams from Trinity College of music and it's apperantly easier. They may even do electric guitar!
p.s. Classical guitar players make the worlds best electric bass players (in my opinion).