Hello there. 

You'll find the form for the Polytechnic examination on the exam conducting body's official website. 

As you have written your question in Bengali, I'm assuming that you are asking for the forms of Polytechnic examination conducted by the West Bengal State. 

The application forms of the same are already released since January 29, 2019 and the last date to submit the form is that on March 6, 2019. The application form is available on both online and offline modes. The admit cards for the same will be released on April 3, 2019. 

Please check the official website of JEXPO for the application form. Here's the link for the same: https://exam.webscte.co.in/JEXPO-VOCLET

For more relevant information kindly check the link mentioned below: 

https://www.google.com/amp/s/engineering.careers360.com/articles/jexpo/amp

Hope this helps. 

All the best.