Hi Manohar -
If your interviewer is expecting you to have two years worth of experience, it will be difficult (if not impossible) to "cram" for an interview and appear credible. Sorry.
There are some basic questions / answers you might be able to memorize ahead of time (try Googling "Tableau Interview Questions") , but any decent interviewer will then take you deeper into the subject, and it'll become clear to them that you don't yet know what you need to.
I'd suggest you start training yourself on how to use the tool vs. trying to "fake it"...I just don't think it'll go well for you
Here's a place to start: