1, you should have some knowledge of accounting and auditing, at least you should go back to open the examination.
2, familiar with Excel, Word and other office software and familiar with the general operation of audit software. Audit assistants often do some manual work, such as losing Excel forms and testing with Excel. Familiarity with computer software can lighten their burden.
3, familiar with the basic audit procedures, which subjects generally do what procedures (such as bank deposits, you have to be able to send letters, check statements and so on. )
If you don't understand, ask the teachers and colleagues who came before.
As for the audit process, you have to understand and learn.
But as an assistant, I can't give you many important tasks, and I don't trust you. It's best to do the basic things well before others will pay attention to you.