Syncing multiple Google calendars on iOs Calendar
If you are getting crazy trying to sync all your Google calendars on your iPhone or iPad here is the solution:
Creating a gmail account from settings > mail, contacts, calendars you can than sync the default Google calendar with your Calendar app. But if you create a new calendar on Google, this is not sync on your iDevice.
After reading several posts on how to sync my extra calendars I finally find out the solution… And it’s really simple:
You just have to go to that page https://www.google.com/calendar/iphoneselect and select calendars you want to see on your device. That’s all