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Hi Alankrita! Check out Tableau's official certification page for some guidance: Certification | Tableau Software. And hey, I just noticed that one of my quotes is actually on that page! How fun!
In case you don't see it, here are the two prep guides:
I used the Tableau 8 versions of those guides and they were very helpful. You'll probably receive a combination of multiple-choice questions and judged answers (in which you'll have to build a sheet, dashboard, etc). Some of the questions are about basic Tableau knowledge (e.g. what a context filter is) and some are applied questions that require you to use Tableau to find the answer.
You should also pay close attention to best practices, because you may get questions on those, and I have a feeling that a lot of people are blindsided by them because they learned Tableau on the job and never thought to look at official best-practice info. Here's Tableau's official white paper on visual best practices: