To access your student's missing assignments, you can check them on Schoology 
*Note that not all teachers use Schoology, but all teachers use Infinite Campus.

Infinite Campus Portal

Infinite Campus Portal App "Campus Parent" and "Campus Student"

                 Campus Parent App                             Campus Student App
  • You must set up your Campus Portal account BEFORE you can use the App on your Smartphone. If you are new to Infinite Campus and need a Portal Account - Request Access to Infinite Campus Portal
  • Search the App Store for the Campus Parent or Campus Student app and download
  • District Name = Grossmont
  • Enter your username and password that you have already set up