Using the New Outlook for Mac features in educational settings
Open your Google Calendar
Go to the calendar you want to sync and hover over it. Click the 3 dots menu and select settings and sharing.
Scroll down to "secret address in iCal format" and press the copy button you see next to it.
In the pop-up click OK
Go to Outlook and in the sidebar, click the calendar icon.
Then click "add calendar"
In the pop up click "subscribe from web"
Click the box and paste the url by using Command + V.
Then, name your calendar. You can also customize it to your liking.
Once you are done. select import.
Note: this method is done using the web versions of both the calendars. The mac versions of the calendars behaves a little differently. I would recommend you do the transformation on the web calendars first, and then they will also show up in your Mac calendars.