If you need to bulk invite students to a Google Classroom you can use a Bromcom Quick Report to find the student emails

In Bromcom select Reports > Quick Report > Quick Report

Scroll down to find Student email and tick it

Click on the Right hand arrow to add it as a column to the report

Slide the button on "Advanced Mode", then click on the "+" and choode "Add Group Information"

Select your "Subject" e.g. ICT by clicking in the box and selecting from a list

Select "Membership Attributes" and choose "Group Description"

Switch OFF Advanced Mode

Click in the 3 lines in the Year Group Name

Select the Year Groups needed

Select Actions > "Export to Excel"

You can use the the Excel sheet to copy and paste the list of students into the Google classroom invite