On your computer, open the Google form spreadsheet. Go to Form, Edit form.
Copy the URL at the bottom of the form. Paste into an e-mail message and send to your iPad email (which may be the same).
Open your iPad email, open the email and tap the link. Once the form is open, tap the same icon you would to add a bookmark, the square with an arrow, and then select Add to home screen.
Add a title, select add.
The icon will appear on one of your home screens. I have created a data collection folder where I keep all of these icons. Using the iPad to collect student data is very efficient.