KPMG Grades:
A = Partner
B = Director / Senior Manager
C = Manager
D = Senior Consultant
E = Consultant / Analyst
Typically, on the Audit side of the firm, you would be an E grade until you qualified, after which you'd be promoted to D grade. Generally speaking, each grade also has (unofficial) years attached (E1/E2/E3 etc) which dictate your charge-out rate, but there's no fixed length of time you have to stay in a particular grade before being promoted.