Hey Amrutha,the following are the best colleges you can get in vijayawada irrespective of branch,

Velagapudi Ramakrishna Siddhartha Engineering College

Prasad V Potluri Siddhartha Institute of Technology

Andhra Loyola Institute of Engineering and Technology

Dhanekula Inst Of Engineering Technology

R K College of Engineering

Lakireddy Bali Reddy College of Engineering

KLU(you need to attend KLU counselling seperately)

other than Krishna dist:

Gayatri Vidya Parishad College for Degree and PG Courses,vishakhapatnam

RVR and JC College of Engineering,guntur

All the best!