As per my understanding, we have 14 day trial versions for prep,desktop and server but the 1 yr student version ( free ) is available only for prep and desktop. Is that right?
So basically there is no student version for tableau server?, Right?
Also, I think if we have a licensed key for tableau server, we can use the same key on 3 installations ( dev, test, prod). Am I right?

Hi Saurabh
You're right, the Tableau for Students program includes Tableau Desktop and - since May of this year - Tableau Prep. There is no student version for Tableau Server.
Further details are in the FAQs below...
Tableau for Students FAQs
Also you are correct in saying the Tableau Server license allows up to 3 activations (so one production environment and then two non-production environments which could be Dev or QA etc.)
https://kb.tableau.com/articles/HowTo/test-environment-license
Hope this helps
Ciara
[Program Manager - Tableau Community]