what are big three audit firms in srilanka

if you doing professional exams , you must want to attended to a firm , because you must get a audit experience.
Are you doing chartered accountancy you want 3 year audit experience , 1 for certificate level and 2 for strategic level.
i will tel you what are most reputable firms in srilanka, if you want to get experience.

1 PWC(price water house coopers)
2 Ernst & Young (specialized for internal audits)
3 KPMG( Specialize for external audits)
 
But i will advice you, you must stay in a small firm at first specially for certificate level , for strategic level  you must go for a above firms.