Yes, you can tag your customer on the based on the option they select. Please follow the below Instruction to enable this feature at your store.
1. Login to the form builder app dashboard.
2. Click edit.
3. Select your drop down value, Insert code aaa-auto-tag in the name field.
4. Save the changes.
Whenever a user submits the form and selects the value from drop down option. It will automatically save details with the value tag.
Suppose – A user select school2 while submitting the form.
Check: Go to the customer section from your Shopify dashboard and select customer tag.