Hii Bidisha!

In the eligibility criteria of WB JECA, there's no specific mention about the number of attempts and their is no age limit. The candidate must have completed graduation from a recognised university with minimum percentage varying from subject to subject. You will get the exact data on Eligibility in the link given below-

https://www.google.com/amp/s/it.careers360.com/articles/wb-jeca/amp

Hope this helps.

Good luck!