To add Google Calendar to ScholarPack, go to your Google Calendar page.
Once here, on the left you should see your Google profile under "My Calendars" - hovering over this reveals three dots that look like this:
In the image above, you can see the three dots to the right of ScholarPack Support. Click on this, then select "Settings and Sharing".
It will take you to a page with "Calendar Settings" at the top. Scroll down to "Access permissions" and ensure you tick 'Make available to public'
Scroll down this page to a section labelled "Integrate Calendar" - in this area, you'll see your calendar ID and a number of different links. The correct area you want to copy is the "Embed Code" section, which will look something like the screenshot below.
Copy this link and then head back to ScholarPack.
In ScholarPack, go to Admin > Config > Core Setup > School. Here is your School Details table, where you click "Edit" then scroll to the bottom of the table where you can insert the link you've just copied:
Once this is done, click the 'Update' button and your calendar will appear in Home > Calendar.