Users with Super Admin/Admin Access can create and edit sessions in Campus 365. 
If you're a Super Admin/Admin and want to create a new Academic Year/Session for your school, you'll need to navigate to Settings > Session.
On the Sessions settings page, create an academic year having a one-year duration. 
Example 2018-2019 (Starting on 1st April 2019 and ending on 31st March 2019). Batches can be linked with this academic year.