Appearing for JEE Main 2018, have a look, how previous years JEE was. Here are past years JEE Main Question Papers, you can download and practice and/or take as Mock Test.
Document_Pdf_126
Document_Pdf_177
JEE(Main)-2016-Paper-with-Solution
JEE-Main-2017-Paper-with-Solution
Document_Pdf_126
Document_Pdf_177
JEE(Main)-2016-Paper-with-Solution
JEE-Main-2017-Paper-with-Solution