Hello there

Yes it's true that if the company like Google is looking for campus placement then it will look for top colleges but it doesn't mean that they don't hire engineers outside from the top colleges but yes it's very unusual. But what you can do is that you can join another any company as a fresher there and after getting good knowledge and experience from that company you can make your profile strong enough and after that you can apply for your dream job or that's google Or in Microsoft.

I hope it helps you!

Thank you!