Dear Sai,

As you mention your rank is 6126, it will be very difficult to get into Sri Venkateshwara University for MCA course as it requires very good rank though u can get admission in some of the other reputed colleges. Here's best pick of colleges for you -

1) Madanapalle Institute of Technology and Science, Chittoor

2) Prasad v. Potluri Siddharth Institute of Technology, PVPSIT, VIJAYAWADA

3) Pydah college of engineering and technology, Visakhapatnam

4) Rajeev Gandhi memorial college of engineering and technology nandyal, Kurnool

5) SRK Institute of Technology, Vijayawada 

Hope you get into the best college