Sak - candidates with accountancy qualifications have a lot of options open to them within consulting - particularly at the major brand consulting firms. Right now on Top-Consultant you will see lots of consulting firms looking specifically to recruit candidates with ACA / ACCA qualifications (Accenture, Ernst & Young, etc).
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As for exam results - it is usually your most recent experience / achievements that are of greatest importance. A below-average set of exam results will be more than offset by having achieved high ratings within your Big 4 firm since then.
Hope that helps & good luck