the online counselling will start from first week of june and will continue till july.

kindly be active and keep a look on the notices from the official website.

till then you can also keep a look on the articles whereas the mock counselling will start from 28th may that is it ha already started and will be done till june 2, 2018 from 11 am to 5 pm

refer to 

https://engineering.careers360.com/articles/wbjee-counselling