Which college is the best among Motilal Nehru, PGDAV, Shyam Lal, Shivaji and Ramanujan?

Ramanujan and Shivaji are the best options. Shivaji will offer you a great campus experience compared to the other colleges mentioned here. Whereas, Ramanujan will offer great infrastructural facilities. 

You can go to Motilal Nehru if you really want to get into the south campus. However, students usually go to Ramanujan or Shivaji after making the cutoff. So, choose wisely.