How to prepare for assessment for internship

I have an interview in almost 2 weeks for an internship which includes a 1 hr Excel assessment. It’s for an accounting/financial reporting/reporting analyst internship so I am assuming it will be in that context.

As an Excel beginner, what are the main skills needed for an assessment and also, how difficult will the assessment be. On the job description, it says knowledge of advanced excel so I don’t know what level to go for