Rockschool Guitar Technical Companion Debt -8. Complete Rockschool technical exercises for guitar in one easy to use book. Here you will find all the scales, arpeggios, chords and riffs needed to complete the Technical Exercise section on the Rockschool's guitar grade exam printed in full. This book should be read in conjunction with the relevant grade books published by Rockschool. for Debut and Grade 1-8 and the syllabus guide for guitar.