Hello Pavan Kumar,

       I understand your concern and I am here to help you !!

         So, all the College's which you have mentioned above are the good colleges across andhra Pradesh amd i arrange them in the order for Mechanical engineering as follows,

1. Sree Vidyanikethan engineering college Tirupati.

2. Velagapudi Ramakrishna Siddhartha Engineering College Vijayawada.

3.SRKR engineering college.

4. Vignan Institute of technology.

   So, pick the best one from these.

All the best !!

Vidyanikethan is best among these .

As the placement are good for it 

Also no doubt vignan is good too .

For mechanical engineering

Vidyanikethan is a premier institute with highly qualified professional faculty and good number of placement opportunities.