Hello candidate, your brother's rank is quite low and would be difficult to get admission in good government colleges. Please use this link below to know about the colleges that you can get admission in-

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/b-tech/resources/ap-eamcet-college-predictor&ved=2ahUKEwjGgf_F8ITjAhV84HMBHX9PC54QFjABegQIBhAH&usg=AOvVaw13_-Kpo7G8Nz2tzXf9OiXu

Hello aspirant As you mentioned that your rank is 70k rank in AP EACMCET under OC category there are many colleges where you can get admission.But it is impossible to get admission in government engineering colleges.No need to worry there are many private engineering colleges where he can admimission. Some of the colleges in Rajahmundry are:

1.Lenora college of engineering.

2.Rajamahendra institute of technology.

3.BVC college of engineering.

Etc.