My frind have iPhone 7plus and we are from same region he can download google classroom and I can not Can someone help me?? I changed region few times and that did not help

You may have to change your Apple ID country.

Use your iPhone, iPad, or iPod touch to change your region

1. Open the Settings app. 
2. Tap your name, then tap Media & Purchases.
3. Tap View Account. You might be asked to sign in.
4. Tap Country/Region.
5. 
6. Tap Change Country or Region.
7. Tap your new country or region, then review the Terms & Conditions.
8. Tap Agree in the upper-right corner, then tap Agree again to confirm.
9. Select a payment method and enter your new payment information and billing address, then tap Next. You must enter a valid payment method for your new country or region.* Learn more about how to change or remove your Apple ID payment information.