Yes, the JEE Main Exam Has the Official Site Here I am giving you the Details of the Official Site of the JEE Main Exam that is As Follow

the Web Address of the Official Site of the JEE Main Exam is jeemain.nic.in/

The top Menus of the Site Are :

Home
FAQ
Mock Test for Computer Based Examination
List of Examination Cities JEE Main 2017
Contact Us

At the Right of the page you may get the Notification Section

On the Left you may get the Current Event Section

Mid of the page Contains the Introduction to JEE Main Exam

Here I am giving you the Snapshot of the Official Site of the JEE Main Exam

JEE Main