I lied about Excel

Many people in this sub have recommended to lie if you have to in order to secure a job, so I did just that at a recent interview.

The position is for an Office Manager and I know I left a really good impression, they even laughed at a few of my jokes. But towards the end one of the HR ladies asked me if I'm proficient in Excel, pivot tables, formulas and I blurted out "of course".

Second round of interviews will be commencing in about 2 weeks and I know there will be a test too, because this first round had them too (composing emails in English, deciding on priorities when delegated three different tasks, etc).

Now my question is: how realistic is it that I can learn pivot tables and the most common formulas in Excel IN TWO WEEKS TIME.

Currently I pretty much only know how to make a table and use the =sum() formula.

Thanks!