WBCS Main Question Papers are available here from 2016 onwards.
Click here for Question Papers of Main 2016 onwards
For WBCS Main Question Papers from 2000-2015 please click here:
WBCS Main Question Paper WBCS 2000-2016
Visit this page for all papers of 2016-2019 Exam: click here.
or https://www.wbcsmadeeasy.in/knowledge-and-download/question-papers/