Since your profile indicates you are from Maharastra.

There are Broadly two ways you can get in b.tech civil in Maharastra,

Firstly, giving state level exam i.e, MH-CET 2019 or you can give the national level exam JEE through which you will be eligible for the b.tech course in any colleges.

There are also few colleges who have their own entrance exam such as S ymbiosis International University for getting in their aided colleges.